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The Wsdcam Doorbell Door/Window Driveway Alarm provides a solution to alert you the moment someone enters your property. It's not only very convenient but also extremely affordable. When movement is detected, the Passive Infrared (PIR) sensor sends a wireless signal to the receiver from up to 280m/918ft away. Adjusting the receiver, you can choose to be alerted by a high or low chime or alarm tone, or instead, with just a silent LED flash. What's more, the receiver can pair with up to 32 sensors, effectively securing a large area. We offer many combinations of sensors and receivers, just choose what best fits your needs. To avoid false alarms: Don't mount the PIR sensor in direct sunlight (as moving heat sources would trigger the PIR) or in a place affected by wind. When installing outside, it's best to mount it in a shady, protected place with minimal changing temperatures. Also, avoiding mounting on UPVC or metal doorframe surfaces which may reduce the transmission range. Specifications: Power Supply (Receiver): 7(AAA) alkaline battery x 3 (not included) Power Supply (PIR Transmitter): 5(AA) alkaline battery x 3 (not included) Motion detecting range: 2 - 8 m/6.6-26ft Operating range: 280m/918ft Ring Volume: ≤113dB ( within 0.5 m/1.6ft) Weather resistant of PIR Sensor: IP44 Box Contents 1 x PIR Transmitter 1 x Doorbell Receiver 1 x Instruction Manual 1 x Desktop base 1 x Adjusting base 1 x 3M Double Tape 2 x Screws