Good waterproof design, can effectively cope with all kinds of bad weather, so that the internal components are not eroded by rain! The use of hemispherical optical lens concentrates the light beam precisely without scattering, and the automatic strong light adjustment system can effectively avoid the interference of strong light and car headlights Single beam photocell sensor/single beam detector is used for automatic slide door, coil door , garage door windows etc. Consists of a transmitter and a receiver, and the integrated amplifier can produce infrared beam. Narrow infrared beam (I or II) can avoid interruption by external light Even installed at low height(20-40cm from the floor), the detecting distance can also be guaranteed(5-15meters). The beam produced by provides a self-detecting function for the sliding doors. Once the self-detecting beam is interrupted, the door will stop closing and reverse rapidly to the utmost width. The door will open until the detecting beam is resumed. When the door completely closes, the detecting beam becomes invalid. 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 Install infrared cross-radiation on the left and right sides of the entrance of the barrier gate, connect the gate, when a vehicle enters and cut off the infrared radiation barrier, the gate will lift up after receiving the signal Color: Black Material: plastic Package Contents: 2 pair x Single 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.