This 2 in 1 alarm system with 90dB sound and flashing light is specially designed for home safety protections with real-time alarm, detecting house condition timely. Feature: 90dB loud alarm with 18 alarm ringtone optional. 2 power modes: USB cable powered and battery powered. And you can see battery level and battery low notification via smartphone APP. Support APP remote control. Linkage with other home devices for alarm, add scene with intelligent human presence sensor to alarm once human detected. Power off memory function. Share the device to your family members to control the siren alarm together. Intelligently check the record and automation record on smartphones. Specifications: Main color: white Main material: plastics Sound: 90dB Battery: 2 * CR123A-3V (not included) Item size: 68 * 68 * 33mm / 2.7 * 2.7 * 1.3in Package size: 95 * 85 * 50mm / 3.7 * 3.3 * 2.0in Package weight: 110g / 3.9ounce Packing List: 1 * Siren Alarm 1 * Screw 1 * Sticker 1 * User Manual 1 * USB Cable