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 doors, 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