Feature: 1. INFRARED TRANSMISSION: This infrared beam sensor adopts digital frequency modulation demodulation technology and utilizes infrared to transmit digital signals 2. AUTO FOCUS: This infrared sensor has automatic focusing circuit design, sound and light calibration and catch, there is no need to adjust and focus during installation. 3. INTELLIGENT DETECTION: When someone comes into contact with two adjacent or more beams, the alarm outputs triggering the infrared detector, which could intelligently detect, no alarm when small animals pass by. 4. SAFETY FEATURES: This IR beam sensor also has intrusion alarm functions such as tamper resistance, cutting resistance, and infrared interference prevention. 5. WIDE USAGE: The infrared fence detector is widely used in window, balconies, garages, villas, schools, supermarkets, office buildings, etc. Specification: Item Type: Infrared Beam Sensor Material: PC, Aluminum Alloy Infrared Beam: 4 Working Current: Transmitter I ≤35mA, Receiver I ≤45mA Response Speed: ≤80ms Response Time: ≥1.5s Feature: 4 Channel PWM Alarm Output: NC NO Relay Output Optical Axes Adjustment: Horizontal 180° Auxiliary Function: Power Indicator Light, Alarm Indicator Light, RT Thermal Indicator Light, Buzzer. Package List: 1 x Transmitter1 x Receiver1 x Instructions4 x Long Screw4 x Anchor8 x Short Screw