Consists of a transmitter and a receiver, and the integrated amplifier can produce infrared beam produced by MICROCELL provides a self-detecting function for the sliding doors. Once the self-detecting beam is interrupted, the door stop closing and reverse to the utmost width. The door open until the detecting beam is resumed. When the door completely closes, the detecting beam becomes invalid single beam infrared The combination of advanced circuit design and advanced manufacturing technology makes it have excellent performance and stability, superior quality, and more safe and reliable Technology: Infrared Receiver Range:Less than 15m (Range can be reduced to 30% in bad weatherconditions: for, rain, dust, etc) Infra-red Frequency: 1.92Khz POWER SUPPLY: 12 to 24V DC/AC WAVE LENGTH: 940nm INPUT: RX 15MA-TX 30MA OPERATING TEMPERATURE:-10℃ to 70℃ RELAY OUTPUT:1A max 36V (The product appearance and printed words depending on the batch, but this does not affect use) Color: As Shown Material: PCB Package Contents: 1 * Lnfrared Beam Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.