Features [Wireless Motion Sensor Alarm] Includes 1 receivers and 2 transmitters, with 3-7m/ 9.8-22.9ft effective detection range, 120 detection angle, can effectively detect movement in surrounding areas and trigger alert to the linked receiver. [Large Wireless Transmission Distance] Signals with strong penetration force can be sent to the receiver more than 200m/ 656ft away to warn you, providing security for your property and loved ones. [IP52 Waterproof] With large waterproof cover and deepened groove, no fear of rainy days, suitable for outdoor use, widely applied in front do ors, window frames, driveways, walking paths, shops, garage, and more. [38 Chimes Optional] There is always one chime you and your family love; with built-in high-quality speaker, low power consumption, 4 levels of adjustable volume, no worry of that you can't hear the ringing. [Power Supply] The receiver can be easily plugged into a standard outlet inside your home, and the transmitters are powered by 3 * AAA batteries (not included), convenient for placing them at the entrance to your driveway. Specifications Color: Black Material: ABS Detection Angle: 120 Detection Range: 3-7m Transmission Range: 200m (without obstacles) Frequency: 433MHz Ringing Tones: 38 Power Supply of Transmitter: 110-240V plug Power Supply of Receiver: 3 * AAA batteries Transmitter Size: 8.5 * 8 * 2cm/ 3.3 * 3.1 * 0.78inch Receiver Size: 8 * 8 * 5.5cm/ 3.1 * 3.1 * 2.1inch Package List 2 * Transmitter 1 * Receiver