EXPLORE MORE CATEGORIES
- Home
- »
- Our Products
- »
- SENSOR
SENSOR
GAS SENSOR
FLEX FORCE SENSOR
PIR SENSOR
Flammable Gas
Smoke Sensor
Alcohol Gas Sensor,
Methane CNG Gas Sensor
LPG & Natural GAS Sensor
Carbon Monoxide Sensor
Air Quality Sensor
Alcohol Sensor
Hydrogen Gas Sensor.
AND MANY OTHER
FLEX FORCE SENSOR
PIR SENSOR
Flammable Gas
Smoke Sensor
Alcohol Gas Sensor,
Methane CNG Gas Sensor
LPG & Natural GAS Sensor
Carbon Monoxide Sensor
Air Quality Sensor
Alcohol Sensor
Hydrogen Gas Sensor.
AND MANY OTHER
Soft Pot Potentiometer
Product Price: Rs 700 / PieceGet Best Price
Product Details:
| Part Number | IP65 |
| Resistance Tolerance | 20% |
| Max Operating Voltage | 100 V AC |
| Insulation Resistance | 100 M Min |
| Rated Power | 0.1 W |
The SoftPot works in multiple configurations, such as linear, serpentine, and elliptical. It operates in temperatures ranging from -45°C to 50°C and is ideal for products that need a sealed sensor with a tight form factor. It’s no wonder it became a popular option for clients in the medical, dental, and robotics industry. The SofPot is also a versatile sensor that can operate by human touch. It can provide the desired linear output regardless of the shape of the product it’s attached to.
Get Best QuoteRequest A Callback
Melexis MLX 90614
Product Price: Rs 500 / PieceGet Best Price
Product Details:
| Brand | Melexis |
| Usage/Application | Temperature Measurement |
| Type | Temperature Sensor |
| Part Number | 90614 |
Get Best QuoteRequest A Callback
STP9CF55h TEMPERATURE SENSOR
Product Price: Rs 1,000 / PieceGet Best Price
Product Details:
| Usage/Application | Industrial |
| Brand | CHINA |
| Type | SENSOR |
| Part Number | STP9CF55H |
| Mounting Type | PCB MOUNT |
| Model Name/Number | STP9CF55H |
Get Best QuoteRequest A Callback
DS3231 RTC Module
Product Price: Rs 350 / PieceGet Best Price
Product Details:
| Part Number | DS3231 |
Additional Information:
- Delivery Time: 2 - 4 DAYS
Get Best QuoteRequest A Callback
LM35 Temperature Sensor
Product Price: Rs 70 / PieceGet Best Price
Product Details:
| Usage/Application | Temperature |
| Packing Type | Box |
| Frequency | 50/60 Hz |
| Current | 200 mA |
Get Best QuoteRequest A Callback
MQ-2, Flammable Gas and Smoke Sensor
Product Price: Rs 165 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-2 |
| Target gases | LPG, Propane and Hydrogen |
| Operating Voltage | 5V |
| Display Type | Digital |
| Size | 32mm x 22mm x 27mm/1.26'' x 0.86'' x 1.06'' |
| Operating Humidity | 0-95%RH |
| Preheat Duration | Over 24 hour |
| Working Voltage | DC 5 V |
| Application | Automobile |
| Weight | 50 grams |
| Voltage | 24 V |
| Circuit voltage | 5.0V+-0.2V |
| Heater resistance | 31 ohm +-3 ohm |
Gas Sensor(MQ2) module is useful for gas leakage detecting(in home and industry). It can detect LPG, i-butane, methane, alcohol, Hydrogen, somke and so on. Based on its fast response time. measurements can be taken as soon as possible. Also the sensitivity can be adjusted by the potentiometer.
MQ-2 Semiconductor Sensor for Combustible Gas:
- Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensors conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
- MQ-2 gas sensor has high sensitity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application.
Get Best QuoteRequest A Callback
Flex Sensor 2.2
Product Price: Rs 350 / PieceGet Best Price
Product Details:
| Flat Resistance | 25K Ohms |
| Resistance Tolerance | + / - 30% |
| Bend Resistance Range | 45K to 125K |
| Length | 2.2" |
| Application | Automobile |
| Product Type | Flex Sensor |
A simple Flex Sensor 2.2" in length. As the sensor is flexed, the resistance across the sensor increases. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. I love the Nintendo Power Glove. It''s so bad! The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend). Connector is 0.1" spaced and bread board friendly. Check datasheet for full specifications.
Note: Please refrain from flexing or straining this sensor at the base. The usable range of the sensor can be flexed without a problem, but care should be taken to minimize flexing outside of the usable range. For best results, securely mount the base and bottom portion and only allow the actual flex sensor to flex.
Get Best QuoteRequest A Callback
Flex Sensor 4.5
Product Price: Rs 675 / PieceGet Best Price
Product Details:
| Length | 4.5" |
| Bend Resistance Range | 45K to 125K |
| Flat Resistance | 25K Ohms |
| Resistance Tolerance | + / - 30% |
| Application | Automobile |
| Product Type | Flex Sensor |
Get Best QuoteRequest A Callback
Flexiforce Pressure Sensor - 100lbs
Product Price: Rs 2,350 / PieceGet Best Price
Product Details:
| Accuracy | 0 ~ -90 KPa |
| Thickness | 0.203 mm |
| Length | 191 mm |
| Width | 14 mm |
| Output | Digital Sensor |
| Sensor | Flexiforce pressure sensor |
| Usage | Pressure Sensor |
Other Details:
- Detect and measure a relative change in force or applied load
- Detect and measure the rate of change in force
- Identify force thresholds and trigger appropriate action
- Detect contact and/or touch
Get Best QuoteRequest A Callback
TTP223B Touch Sensor, 4-Channels
Product Price: Rs 35 / PieceGet Best Price
Product Details:
| Model Number | TTP223B |
| Channels | 4 |
| Input Voltage | 2.0 to 5.5 V DC |
| Response Time | 60 ms |
| Interface | IC |
| Color | Blue |
| Operating Temperature | -20 to +70 deg C |
| Dimensions | 24 x 24 x 7.2 mm |
The Digital Sensor TTP223B Module Capacitive Touch Switch is based on a touch-sensing IC (TTP223B) capacitive touch switch module. Allows you to remove the worry of conventional push-type keys.
Digital Capacitive Touch Switch Module is based on TTP223B. Normally, it outputs low and keeps at low power state. When a touch is sensed on the circular marked region, it outputs high and switches to the quick response state. When not being touched for 12 seconds, it switches to low power state again.
If the module is mounted in the surfaces of non-metallic materials such as plastic, glass, acrylic, you can make the keys hidden in the walls and desks.
In addition to the thin paper ( non-metallic ) covering the surface of the module, as long as the correct location of the touch, you can make hidden in the walls, desktops and other parts of buttons.
Get Best QuoteRequest A Callback
DHT22 Digital Temperature & Humidity Sensor Module
Product Price: Rs 280 / PieceGet Best Price
Product Details:
| Size | 38 x 20 mm |
| Temperature Range | -40 to 80 deg C |
| Frequency | 50-60Hz |
| Supply Voltage | 5V |
| Power Source | Electric |
Get Best QuoteRequest A Callback
Sound Detector Sensor
Product Price: Rs 80 / PieceGet Best Price
Product Details:
| Operating Voltage | 3.3V-5V |
| Packaging Size | 36.5 x 17 x 10 mm |
| Weight | 4 - 5 Gm |
| Packaging Type | Box |
Get Best QuoteRequest A Callback
DHT11 Temperature and Humidity Sensor
Product Price: Rs 140 / PieceGet Best Price
Product Details:
| Accuracy | +-5% |
| Frequency | 50/60 Hz |
| Working Voltage | 3.3 V - 5 V |
| Storage Temperature | -25 ~ +130 Degree C |
Get Best QuoteRequest A Callback
MQ-3, Alcohol Gas Sensor
Product Price: Rs 90 / PieceGet Best Price
Product Brochure
Product Details:
| Application | Car Alcohol Alarm, Breathalyser |
| Operating Voltage | 2.5V ~ 5.0V |
| Material | PCB |
| Model No | MQ 3 |
| Output Signel | 4-20mA |
| Packaging Type | Box |
This Alcohol Sensor MQ3 is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor.
Get Best QuoteRequest A Callback
MQ-6, Gas Sensor Module
Product Price: Rs 100 / PieceGet Best Price
Product Brochure
Product Details:
| Application | Automobile |
| Display Type | Digital |
| Model | MQ-6 |
| Power Source | Electric |
| Material | PP |
| Sensor Type | Semiconductor |
| Detection Gas | Isobutane,Butane,LPG |
Sensitive material MQ-6 gas sensor is used to clean the air in the lower conductivity of tin dioxide (SnO2). When there is the environment in which the combustible gas sensor , conductivity sensor with increasing concentration of combustible gases in air increases . Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-6 gas sensor for propane , butane , liquefied petroleum gas sensitivity is high, natural gas and has a good sensitivity. This sensor can detect a variety of flammable gas , is a low-cost sensors for a variety of applications
Suitable for home or industrial LPG ( liquefied petroleum gas ) , butane , propane , LNG ( liquefied natural gas ) detection devices. Excellent resistance to ethanol vapor , smoke interference Module
Features :
1 , using high-quality dual-panel design, with power indicator and TTL signal output instructions;
2 , the switching signal having a DO (TTL) output and analog output AO ;
3, TTL output valid signal is low . ( Low-level signal when the output light can be directly connected to the microcontroller or relay module )
4 , 0 ~ 5V analog output voltage , the higher the concentration the higher the voltage.
5 , propane , butane , LPG, LNG has a good detection sensitivity.
6 , there are four screw holes for easy positioning ;
7 Product dimensions : 32 (L) * 20 (W) * 22 (H)
8 , has a long life and reliable stability
9 , rapid response and recovery characteristics
Get Best QuoteRequest A Callback
Methane CNG Gas Sensor MQ4
Product Price: Rs 140 / PieceGet Best Price
Product Brochure
Product Details:
| Application | Industrial |
| Measuring Range | 200ppm-10000ppm |
| Sensitivity | High |
| Output | Analog |
| Power Supply | 5 V |
| Output value | 4-20mA |
Methane CNG Gas Sensor MQ4 is a simple-to-use compressed natural gas (CNG) sensor, suitable for sensing natural gas (composed of mostly Methane [CH4]) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 200 to 10000ppm. This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
Get Best QuoteRequest A Callback
MQ-7,Carbon Monoxide Sensor
Product Price: Rs 140 / PieceGet Best Price
Product Brochure
Product Details:
| Measuring Range | 20-10,000 ppm |
| Heater Power | 5V DC |
| Operating Temperature | 0 deg C to 50 deg C |
| Gas | Carbon Monoxide |
| Storage Temperature | -30 deg C to 60 deg C |
| Display Type | Digital |
Get Best QuoteRequest A Callback
MQ-8, Hydrogen Gas Sensor Module
Product Price: Rs 150 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-8 |
| Target gases | Hydrogen Gas |
| Application | Industrial |
| Operating Voltage | 5V |
| Operating Humidity | less than 95%Rh |
| Preheat Duration | Over 24 hrs |
| Digital Output | LED |
| Model No | MQ 8 |
| Power Source | Electric |
Get Best QuoteRequest A Callback
MQ-6, Gas Detector Sensor Module
Product Price: Rs 140 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-6 |
| Model Number | MQ 6 |
| Target gases | LPG, iso-butane, propane |
| Application | Industrial |
| Operating Voltage | 5V |
| Operating Humidity | 0-95%RH |
| Preheat Duration | Over 24 hour |
| Power Source | Electric |
| Packaging Type | Box |
| Circuit voltage | 5V+-0.1 |
| Load resistance | 20K ohm |
| Heater resistance | 33 ohm +-5% |
This is a very easy to use low cost semiconductor Gas sensor Module with analog and digital output. This module uses MQ6 LPG gas sensor as a gas sensing element. It requires no external components just plug in Vcc & ground pins and you are ready to go.
For Digital output the threshold value can be easily set by an on-board potentiometer. Using this module you can easily interface MQ6 LPG gas Sensor to any Microcontroller, Arduino or even Raspberry Pi.
Get Best QuoteRequest A Callback
MQ-3, Alcohol Gas Sensor
Product Price: Rs 120 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-3 |
| Application | Workplace |
| Target gases | Ethanol Vapour |
| Operating Voltage | 5V |
| Model Number/Name | MQ 3 |
| Operating Humidity | 0-95%RH |
| Preheat Duration | Over 24 hour |
| Power Supply | Car Smoking Plug |
| Color | Orange |
| packaging Type | Box |
| Circuit voltage | 5V+-0.1 |
| Load resistance | 200K ohm |
| Heater resistance | 33 ohm +-5% |
Get Best QuoteRequest A Callback
MQ-5, Lpg Gas Sensor
Product Price: Rs 120 / PieceGet Best Price
Product Brochure
Product Details:
| Model Number | MQ5 |
| Material | pcb |
| Usage/Application | Industrial |
| Frequency | 50/60 Hz |
| Voltage | 110 - 240 V |
This is a very easy to use low cost semiconductor Gas sensor Module with analog and digital output. This module uses MQ5 gas sensor as a gas sensing element. It requires no external components just plug in Vcc & ground pins and you are ready to go.
For Digital output the threshold value can be easily set by an on-board potentiometer. Using this module you can easily interface MQ5 gas Sensor to any Microcontroller, Arduino or even Raspberry Pi.
This Gas Sensor module is sensitive to LPG, natural Gas & Town Gas. it is also small sensitivity to alcohol & smoke.
Get Best QuoteRequest A Callback
MQ-3, Alcohol Gas Sensor Module
Product Price: Rs 145 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-3 |
| Target gases | Ethanol Vapour |
| Application | Workplace |
| Operating Voltage | 5V |
| Operating Humidity | 0-95%RH |
| Preheat Duration | Over 24 hour |
| Material | PCB |
| Packaging Type | Box |
| Circuit voltage | 5V+/-0.1 |
| Load resistance | 200K ohm |
| Heater resistance | 33 ohm +/-5% |
Get Best QuoteRequest A Callback
Flammable Gas And Smoke MQ2 Sensor
Product Price: Rs 90 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-2 |
| Target gases | LPG, Propane and Hydrogen |
| Application | Automobile |
| Operating Voltage | 5V |
| Operating Humidity | 0-95%RH |
| Preheat Duration | Over 24 hour |
| Voltage | 24 V |
| Working Voltage | DC 5 V |
| Weight | 40 - 50 grams |
| Circuit voltage | 5.0V+-0.2V |
| Heating resistance | 31 ohm +-3 ohm |
MQ2 Gas Sensor is useful for gas leakage detecting(in home and industry). It can detect LPG, i-butane, methane, alcohol, Hydrogen, smoke and so on. Based on its fast response time. measurements can be taken as soon as possible. Also the sensitivity can be adjusted by the potentiometer.
MQ2 gas Sensor can detect gas concentrations anywhere from 200 to 10000ppm. MQ2 sensor is very sensitive to Propane, Hydrogen, methane and LPG.
The MQ series of gas sensors use a small heater inside with an electro-chemical sensor. They are sensitive for a range of gasses and are used indoors at room temperature.
The sensitive material of MQ2 Gas sensor is SnO2, which has lower conductivity in clean air. When the target gas exist, the sensor’s conductivity is higher along with the gas concentration rising. MQ2 sensor could be used to detect different combustible gases especially Methane. It is very low cost and suitable for different application. This sensor can be used to make wireless Gas leak detector in home security system.
Get Best QuoteRequest A Callback
MQ-8, Hydrogen Gas Sensor
Product Price: Rs 140 / PieceGet Best Price
Product Brochure
Product Details:
| Model / Part Number | MQ-8 |
| Target gases | Hydrogen Gas |
| Operating Humidity | less than 95%Rh |
| Operating Temperature | -10 DegreeC-50 DegreeC |
| Diameter | 18mm |
| Pins | 6mm High |
| Heater voltage | 5V |
| Power Source | Electric |
Get Best QuoteRequest A Callback
Force Sensing Resistor FSR400
Product Price: Rs 120 / PieceGet Best Price
Product Details:
| Model Number | FSR400 |
| Power Source | Electric |
| Overall length | 1.75" |
| Overall width | 0.28" |
| Sensing area | 0.3" |
| Application | Industrial |
This is a small force sensitive resistor. It has a 0.16" (4 mm) diameter active sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR, its resistance will be larger than 1MΩ, with full pressure applied the resistance will be 2.5kΩ. Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. These sensors are simple to set up and great for sensing pressure, but they aren''t incredibly accurate. Use them to sense if it''s being squeezed, but you may not want to use it as a scale.
Get Best QuoteRequest A Callback
Force Sensing Resistor FSR406
Product Price: Rs 800 / PieceGet Best Price
Minimum Order Quantity: 10 Piece
Product Details:
| Sensing Area (mm) | 0.16" (4 mm) |
| Model Number | FSR406 |
| Brand | ARDUINO |
| Cable Length | 5" |
| Application | Industrial |
| Pitch | 0.1" |
Additional Information:
- Item Code: FSR406
- Pay Mode Terms: T/T (Bank Transfer)
- Delivery Time: 6-12 DAYS
Get Best QuoteRequest A Callback
Hall Effect Sensor A1104
Product Price: Rs 70 / PieceGet Best Price
Product Details:
| Brand | Allegro |
| Part Number | A1104 |
| Application | Industrial, Sensing & Instrumentation, Medical |
| Output Current | 1 mA |
| Operating Supply Voltage | 4.5 to 24 V |
| Supply Current | 7.5 mA |
| Pin Count | 3 Pin |
| Operating Temperature | -20 to +125 Degree C |
The Hall Effect Sensor - Allegro A1104 include the following on a single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, Schmitt trigger, and NMOS output transistor. The integrated voltage regulator permits operation from 3.8 to 24 V. The extensive on-board protection circuitry makes possible a ±30 V absolute maximum voltage rating for superior protection in automotive and industrial motor commutation applications, without adding external components. All devices in the family are identical except for magnetic switch point levels.
The small geometries of the BiCMOS process allow these devices to be provided in ultra small packages. The package styles available provide magnetically optimized solutions for most applications. Package LH is an SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultra mini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte tin plated lead frames.
Features :
AEC-Q100 automotive qualifiedContinuous-time operationFast power-on timeLow noiseStable operation over full operating temperature rangeReverse battery protectionSolid-state reliabilityFactory-programmed at end-of-line for optimum performanceRobust EMC performanceHigh ESD ratingRegulator stability without a bypass capacitor
Get Best QuoteRequest A Callback
FIGARO, MQ-4, Methane CNG Gas Sesnor Module
Product Price: Rs 140 / PieceGet Best Price
Product Brochure
Product Details:
| Model Number | MQ 4 |
| Application | Industrial |
| No of Pin | 6 Pins |
| Packaging Type | Box |
| Power Source | Electric |
Get Best QuoteRequest A Callback
GY-271 HMC5883L 3 Axis Compass Magnetometer Module
Product Price: Rs 250 / PieceGet Best Price
Product Details:
| Communication Modes | Standard IIC communication protocol |
| Measuring Range | +/-1.3-8 Gauss |
| Model | GY-271 |
| Power Supply | 3-5 V |
| Use the Chip | HMC5883L |
Get Best QuoteRequest A Callback
Inductive Proximity Sensor
Product Price: Rs 70 / PieceGet Best Price
Product Details:
| Voltage | 90-230 V AC |
| Frequency | 50/60 Hz |
| Power | 10-30 V DC |
| Current | 250mA |
| Application | Industrial |
Get Best QuoteRequest A Callback
Water Level Sensor
Product Price: Rs 80 / PieceGet Best Price
Product Details:
| Usage/Application | Industrial |
| Current | 20mA |
| Frequency | 50 - 60 Hz |
| Working Temperature | 10 deg C to 30 deg C |
| Working Voltage | DC 3-5V |
Get Best QuoteRequest A Callback
Flexiforce Sesnor A101
Product Price: Rs 480 / PieceGet Best Price
Product Details:
| Model Number | Sesnor A101 |
| Length | 10 - 15.6 mm |
| Width | 5 - 7.6 mm |
| No of Pin | 2 Pin |
| Power Source | Electric |
Get Best QuoteRequest A Callback
Flexiforce Sensor A401-25LBS
Product Price: Rs 700 / PieceGet Best Price
Product Details:
| Color | White |
| Usage/Application | Industrial |
| No of Pin | 2 Pin |
| Length | 25.4 - 30 mm |
| Frequency | 50/ 60 Hz |
Get Best QuoteRequest A Callback
PIR Sensor module
Product Price: Rs 80 / PieceGet Best Price
Minimum Order Quantity: 50 Piece
Product Brochure
Product Details:
| Model | HC-SR501 |
| Detection Distance | 6 meter |
| Color | WHITE AND GREEN |
The Passive Infrared Sensor (PIR) sensor module is used for motion detection. It is often referred to used "PIR", "Pyroelectric", "Passive Infrared" and "IR Motion" sensor. The module has an on-board pyroelectric sensor, conditioning circuitry and a dome shaped Fresnel lens. It is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically-activated lighting systems.
Additional Information:
- Item Code: SENSOR
- Delivery Time: 2-4 DAYS
Get Best QuoteRequest A Callback
Flexiforce Sensor A502
Product Price: Rs 1,200 / PieceGet Best Price
Product Details:
| Width | 55.9 mm |
| Connector | 2-pin Male Square Pin |
| Thickness | 0.203 mm |
| Substrate | Polyester |
Get Best QuoteRequest A Callback
Flexiforce Sensor A301 25LBS
Product Price: Rs 480 / PieceGet Best Price
Product Details:
| Thickness | 0.203 mm |
| Length | 25.4 mm |
| Sensing Area | 9.53 mm |
| Connector | 2-pin Male Square Pin |
Get Best QuoteRequest A Callback
Flexiforce Sensor A201 25LBS
Product Price: Rs 1,200 / PieceGet Best Price
Product Details:
| Length | 25.4mm |
| Width | 14mm |
| Thickness | 0.203 mm |
| Packaging Type | Box |
Get Best QuoteRequest A Callback
Vibration Sensor
Product Price: Rs 70 / PieceGet Best Price
Product Details:
| Voltage | 110 - 220 V |
| Frequency | 50/60 Hz |
| Application | Vibration Sensor |
| Packaging Type | Box |
Get Best QuoteRequest A Callback
MQ-3, Alcohol Sensor
Product Price: Rs 160 / PieceGet Best Price
Product Details:
| Model / Part Number | MQ-3 |
| Target gases | ethanol vapour |
| Application | Workplace |
| Operating Voltage | 3V DC |
| Output Current ( in mA) | 150mA |
| Operating Temperature | -10 DegreeC ~ 70 DegreeC |
| Current | 120mA |
| Frequency | 50/60 Hz |
Get Best QuoteRequest A Callback