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. 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°c~55°c dimensions: approx. 68 * 25 * 20mm / 2.7 * 1.0 * 0.8inch package weight: approx. 69g
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