Features: 1.The sound and light alarm device is an alarm terminal device, and it is suitable for sound and light alarms when a fire occurs. 2.The two?wire system is used for wiring. The main line is terminated with two main lines, and the power supply is connected to the 12 / 24VDC power line. 3.With three different tones, you can choose any tone you like. 4.Built?in 6 LEDs, and the siren will emit a loud sound and a fast flash to remind people to escape the fire. 5.Convenient to operate and use, and it is of high practical value. Specification: Condition: Item Type: Sound and Light Alarm Color: Red Temperature Range: -10-50 / 14-122 Humidity Range: 95%RH Operating Voltage: 12/24VDC Working Current: 40mA / 60mA Flash Intensity: 1.2Ws Flash Period: 1.5S Audio Alarm: 105Db Life of Flash Light: 40,000 (Time) Size: 134 x 115x 48mm /5.3 x 4.5 x 1.9in (Lx W x H) PackageList: 1 x Sound and Light Alarm1 x Instruction Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.