Specification: Item Type: PIR Motion Detector Material: ABS Weight: Approx. 155g / 5.5oz Product Size: Approx. 110x55x40mm / 4.3x2.2x1.6in Battery Parameters: Built-In 2 x CR2 Lithium Batteries Battery Type: Lithium Battery Battery Model: CR2 Nominal Battery Capacity: 850mAh Pet-Proof: 20kg Function: Independent use, no host/gateway, anti-pet function, dual-window detection, human activity reminder, low battery reminder Quiescent Current: ≤20uA Detection Distance: 7m / 23ft Detection Angle: 90° Working Environment: -10℃-50℃, 5%-95% RH Package List:1 x Detector2 x Screw2 x Expansion Tube1 x Bracket1 x Rubber Ring1 x Accessory1 x English Manual Note:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. PIR detector with dual probes, high capturing performance and strong anti‑false alarm ability. It adopts wired infrared technology, can be used independently, double‑window detection, reminder of human activities. Detection range is about 7m, detection angle is about 90 degrees, high sensitivity, stable performance. Anti‑pet identification technology, immune to pets under 20 kg, prevent false alarms when pets pass by. Simple installation, with low battery reminder, the recommended installation height is about 1.8‑2.4m.