Features1High Sensitivity: The lens type optical element strengthens the beam intensity, has good immunity to false alarms caused by rain, snow, fog, etc., highly convenient to use. 2Low Battery Reminder: When the battery is low, the red LED on the transmitter side will flash, and the receiver's buzzer will sound every second to remind you to replace the battery in time. 3Wide Applications: Provides invisible infrared beams for automation applications such as sliding and swinging doors, garage doors and security applications, outdoor or indoor fencing, etc. 4Waterproof Protection: Infrared gate beam sensor is IP55 waterproof, can be installed indoors or outdoors, small size, easy to install, does not affect the normal function of your device. 5Durable Structure: Infrared gate beam detector is made from superior ABS, wear resistant and durable, the transmitter is powered by 2PCS AA batteries (not included), and the long life can reach about 2 years. SpecificationItem Type: Infrared Gate Beam SensorMaterial: ABSApplication: Home security, access control systemWorking Voltage:Receiver: 12-36VDCTransmitter: 3V (2PCS AA battery, NOT included)Installation Environment: Indoor, outdoorDetection Distance: Approx. 15m / 16.4ydAlarm Time: 3s, 5s, 10s adjustableAlarm Output: Relay contact output NC, NOContact Capacity: 30V DC 3A maximum 250V AC 3A maximumBattery Life: About 2 yearsWavelength: 940nmModulation Frequency: PulseWaterproof Grade: IP55Single Product Size: Approx. 136x54x32mm/5.4x2.1x1.3in Package List1 x Transmitter1 x Receiver4 x Screw4 x Expansion Tube1 x Manual