General description The Shop Doorbell/Passage Alarm Wireless System features a motion/access detector with a communication range of up to 100 meters. It includes 38 different ringtones to welcome your guests and offers three volume control levels: loud, medium, and silent. The system is perfect for use with windows, doors, garage doors, and more, making it an ideal addition to any home or shop. Technical specifications Communication range: up to 100 meters Sensor range: 3 to 7 meters vertically, 3 to 5 meters horizontally Receiver dimensions: 76x80x33 mm Sensor dimensions: 80x59x45 mm Sensor power supply: 3 AAA batteries or 5V USB power supply (not included) Receiver power supply: DC 110V - 240V Compatibility and accessories Includes 2 sensors and 1 receiver Comes with a mounting accessories kit Instruction manual included