Note: It can work in distance between 2 meter to 15 meter, you can remove the lens cover when test in short distance to reduce the infrared focus.Overview:This is upgrade version of single beam sensor with latest LED light and more smt components compared with the old 3 lights handmade model, it's more stable and reliable. When interrupt the infrared, the relay will output switch signal, it can work for access control system, parking barrier, walking gate, vehicle gate and alarm system as body induction. It also can work as window, door and passageway anti-burglar detection or used in museum anti-theft.Specifications:Power Supply: 12V to 24V DC/ACInput: RX 15mA - TX 30mAInfrared Frequency: 1.92KhzWave Length: 940nmWorking Range: 2-15mDetection Distance: 20m (open area)Switch: N/O & N/C OptionalWork With: Access Control System/Parking Barrier/Alarm System,etc.Working temperature: -30°C to +50°CItem Size/Each: 78 * 50 *30mm (D*W*H)Item Weight(with case)/Each: 36gPackage Information:Package Size: Approx. 13.8 * 8.4 * 4.5cm / 5.4 * 3.3 * 1.8inPackage Weight: Approx. 125g / 4.4oz Packing List:1 * Pair of Beam Sensor1 * Set of Mounting Screws1 * User Manual