Features: Wide Application - Works for any door opener. Can be widely used for access control systems, parking lots, defense walls, doors and windows, balconies, garages, passages and other places. Perfect for installing security systems in schools, office buildings, hospitals, backyards, etc. Stable Signal Transmission - high-performance infrared transmitters and receivers. The transmitter produces a reliable, invisible infrared beam up to 20m. If the infrared beam is interrupted, the relay switches the signal output. WATERPROOF AND UV RESISTANT - Fully sealed, waterproof and dustproof egg-shaped cover, sunlight filtering, allows you to work in a harsh environment. Easy installation. Reliable in use - Equipped with advanced safety technology that guarantees multiple protections and safety. The infrared beam from the photocell ensures that the door automatically stops or reverses when an obstacle occurs, protecting your safety and property. Easy installation - Install each pair opposite positions. Then there is an infrared area between these two detection parts. When someone passes the infrared area, the detector sends an alarm signal to the security alarm host (not included here). Specification: Black color Material: PC (Waterproof, UV resistant). ) Detection range: Outdoor: 20m; Indoor: 30 m Detection speed: 30 ms Infrared frequency: 1.92 kHz Wavelength: 940 nm Voltage: DC 12-24 Input current: RX 15 mA - TX 30 mA Output relay: A1 36 W Item size???? e: 76 * 49.2 * 21.6 mm / 3.0 * 1.9 * 0.9 inches Packing list: 1 * Infrared sensor pair (transmitter and receiver). )