ITEM NAME:1PCS Digital 38KHz IR Receiver For Arduino Compatible M&O.38KHz IR Receiver Sensor pin definitions : (1) Output (2) Vcc (3) GND. 1ã€Based on the 38KHz IR Receiver Sensor. 5ã€Modulate Frequency : 38Khz. 7ã€Can be compatible with Wrobot Digital 38KHz IR Transmitter Sensor.