Features:
Wide Application -- Works for all gate openers. Can be widely used for access control system, parking lot, defence wall, door and window, balcony, garage, passage and other places. to be installed for security system in school, office building, hosipital, home yard, etc.
Stable Signal Transmission -- High- infrared & receiver. The creates a reliable and invisible infrared beam to 65in (20m). When interrupt the infrared beam, the relay will output switch signal.
Waterproof & Proof -- Fully- waterproof and dustproof shaped cover, sunlight-filtering , enables it to work in harsh environment. Easy installation.
Reliable to Use -- Features technology that ensures multiple conservation & safety. Infrared Photocell beam will make the gate stop or reverse automatically in of obstruction happening to your safety and property.
Easy to Install -- Install each pair at the opposite positions.Then there is a  infrared area between these two parts. When someone passes the infrared region, the   will send signal to the host (which not included here).

Specification:
Color: Black
Material: PC ( Proof, proof)
Detect Area:  : 20m; Indoor: 30m
Detect : 30ms
Infare-Red Frequency: 1.92Khz
Length: 940nm
Working Voltage: 12-24V
Input  Curren: RX 15mA - TX 30mA
Relay Output: 36W
Item Size: 76*49.2*21.6mm/3.0*1.9*0.9in

Packing List:
1 * Pairt of Infrared ( and Receiver)