Feature 1 Smart Alarm: Siren with 90dB speaker and visible light alarm strobe, can be used as security alarm, burglar alarm and co sensor via wireless protocol. 2 Selectable Tones: 18 selectable alarm tones are pre installed, and the volume of each tone can be adjusted between 3 levels of the low, medium and high. 3 APP Control: Support APP remote control, use with motion sensor, door and window sensor to create scenes, make sound when motion is detected. 4 Power Supply: Long term power supply through USB cable, and powered by CR123A lithium ion battery (not included), can be used anytime, anywhere. 5 Wireless Operation: The sound and light alarm adopts 2.4GHZ wireless frequency, the wireless distance up to 55 meters, has a wide range of applications.Item Type: Smart Sound Light AlarmPower Supply: 2 x CR123A 3V Li Ion battery (battery not included)Noise: Maximum 90dB within 1 meterAlarm Time: 0-1800sWireless Distance: Approx. 55 meter / 180.4ftWireless Frequency: 2.4GHZ Package List1 x Alarm1 x USB Cable1 x User Manual1 x Screw1 x Screw Tube1 x Adhesive Paper