This s-ingle infrared beam alarm can be installed on barrier gate, automatic doors, sliding doors or switch-sensitive doors, and can also be installed at home for anti-theft, has a wide applications. Come on and have a try, it will not let you down. Features: IP55 waterproof level, it can also be used outdoors or in wet areas, rain will not affect normal use. Installed then on both sides of doors and windows, and the host is installed indoors. When someone shuts off the infrared beam, the host will alarm. (Note: The host is NOT included, you need buy a host by yourself.) The detection distance is up to 20m, and the detection distance is long, which can meet the use of most automatic door or translation doors and window to use. Wide applications: This tool can be installed on barrier gate system, automatic doors, sliding doors or switch-sensitive doors, also can be installed at home for anti-theft. Small in size and easy for installation, no need too much professional skills. Specifications: Material: ABS Color: black Power supplys: direct current 12~24V Detecting distance: less than 20m Input current: Transmitter: 30mA Receiving end: 15mA Wavelength: 940 nm Frequency: 1.92KHz Max.load: A1 36V Relay output: NC/NO switch adjustable Item size: 76 * 49.2 * 21.6mm / 3.0 * 1.9 * 0.9in Package size: 79.3 * 45.2 * 29.6mm / 3.1 * 1.8 * 1.2in Package weight: 112g / 4.0lb Packing list: 1 * S-ingle Infrared Beam Snesors