Features: Wide Application – Compatible with all gate openers. Suitable for access control systems, parking lots, perimeter fences, doors, windows, balconies, garages, passages, and other locations. Ideal for security system installations in schools, office buildings, hospitals, and residential yards. Stable Signal Transmission – High-power infrared transmitter and receiver. The transmitter emits a reliable, invisible infrared beam up to 20 meters (65 feet). When the beam is interrupted, the relay outputs a switch signal. Waterproof & UV Proof – Fully sealed, waterproof, and dustproof egg-shaped cover with a sunlight-filtering case allows operation in harsh environmental conditions. Easy to install. Reliable to Use – Features advanced security technology for enhanced protection. The infrared photocell beam causes the gate to stop or reverse automatically when an obstruction is detected, helping to protect people and property. Easy to Install – Mount each pair in opposite positions to create an infrared detection zone between the transmitter and receiver. When the infrared beam is interrupted, the detector sends a signal to the security alarm host (not included). Specifications: Color: Black Material: PC (Waterproof, UV resistant) Detection Range: Outdoor: 20m; Indoor: 30m Detection Speed: 30ms Infrared Frequency: 1.92kHz Wavelength: 940nm Working Voltage: DC 12–24V Input Current: RX 15mA, TX 30mA Relay Output: A1 36W Item Size: 76 × 49.2 × 21.6mm / 3.0 × 1.9 × 0.9in Packing List: 1 × Pair of Infrared Sensor (Transmitter and Receiver)