Features: Wide Application – Compatible with all gate openers. Suitable for access control systems, parking lots, perimeter fencing, doors, windows, balconies, garages, passages, and other locations. Ideal for installation in schools, office buildings, hospitals, residential yards, and more. Stable Signal Transmission – High-power infrared transmitter and receiver create a reliable, invisible infrared beam up to 65 ft (20 m). When the beam is interrupted, the relay outputs a switch signal. Waterproof & UV Resistant – Fully waterproof and dustproof egg-shaped cover with a sunlight-filtering case allows operation in harsh environmental conditions. Designed for easy installation. Reliable Performance – Advanced technology provides multiple layers of protection and safety. The infrared photocell beam enables gates to stop or reverse automatically when an obstruction is detected, helping protect people and property. Easy Installation – Mount each pair in opposite positions to create an infrared detection zone. When an object passes through the beam area, the detector sends a signal to the alarm host (not included). Specifications: Color: Black Material: PC (Waterproof, UV resistant) Detection Range: 20 m (outdoor), 30 m (indoor) Detection Speed: 30 ms Infrared Frequency: 1.92 kHz Wavelength: 940 nm Working Voltage: DC 12–24 V Input Current: RX 15 mA, TX 30 mA Relay Output: A1 36 W Item Size: 76 x 49.2 x 21.6 mm / 3.0 x 1.9 x 0.9 in Package Includes: 1 Pair Infrared Sensor (Transmitter and Receiver)