Description: This is a pair of infrared detector. Install them at the opposite positions. Then there is a infrared area between these two detector parts. When someone passes the infrared region for an adjusted response time, the detector will send alarm signal to the security alarm host (which not included here). Great to be installed for security system in school, office building, hospital, home yard, etc. Features: Four channel frequency adjustment function, suitable for stack installation in the same place. Widespread used for alarm system, access control system, etc. Small and beautiful appearance for infrared beam detector. Unique design of the digital filter circuit. With high levels of anti-RFI / EMI capability. Professional anti-jamming optical housing. Sealed design to anti-rain (fog), dust (worms) and other integrated weather, can keep normal operation in harsh environment. Specifications: Condition: 100% Brand New Case Material: Model ABO-10F Alert Distance: 10m Working Voltage: DC 9-16V Input Current: R-18mA;T-20mA Frequency: 38KHZ Relay Output: 1A 36V(max) Wave Length: 940nm Humidity: 5%-95% RH Operating Temperature: -25℃~55℃ Dimensions: Approx. 68 * 25 * 20mm / 2.7 * 1.0 * 0.8inch Package Weight: Approx. 69g Package Includes: 1 Pair x Infrared Beam Detector 1 x Bag of Install Tools . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.