Description: This wireless alarm receiver is triggered by infrared motion sensors and immediately alerts you when someone enters your stores, homes, office buildings, or factories. It is perfect for use in a home alarm system. Features: The new, high-quality wireless doorbell has a PIR motion sensor and an alert receiver. The PIR motion sensor has good motion detection capabilities within a range of 3 to 7 meters. This special unit has high sensitivity, accurate alarms, anti-interference, and other technology that can effectively monitor human movement in various environments. Perfect for your stores, homes, office buildings, factories, etc. This wall-mounted doorbell has low power consumption and is easy to install. Specifications: Condition: 100% brand new Material: ABS plastic Color: As shown in the picture Transmitter battery: 2 x 3V AA batteries (not included) Receiver battery: 1 x 9V AA battery (not included) Detection distance: 3–7 meters Transmission frequency: 315 MHz Transmission distance: 100 meters (open field) Transmitter size: Approx. 9*6*4.5 cm / 3.5*2.4*1.8 inches Receiver size: Approx 9*6.5*3 cm / 3.5*2.6*1.2 inches Weight: Approx 228 g Package includes: 1 x Transmitter with accessories 1 x Receiver