• Wireless alarm system for entryway with motion sensor and doorbell • Communication between infrared sensor and receiver up to 200 meters in open field • Offers 38 different melodies to customize the welcome for visitors • 4 volume control levels to adjust sound intensity • Alarm mode combines melodies and blue LED display for greater visibility • The sensor detects movement in a vertical range of 3 to 7 meters (45° angle) and a horizontal range of 3 to 5 meters • The sensor is powered by 3 AAA batteries or a 5 V USB power supply (not included) • The receiver operates on DC current from 110 V to 240 V • Receiver dimensions: 100 x 50 x 33 mm; sensor dimensions: 77 x 57 x 45 mm • Perfect for installation on doors, windows, garages, and other access points in homes or businesses