This kind of small horn alarm with beacon lamp is power-on playback type, that is, once the power supply connected, the device will immediately play the sound, which can make the emergency known. It is an important audible and visual alarm device, which sends out alarm signals through alarm sound and flash, widely used for voice reminder, giving safety prompt, public broadcasting, fire safety prompt. Features: Built in 10W horn: give 110dB alarm sound when be triggered. Baking finish steel plate, cold rolled steel material: Waterproof, dust-proof, sturdy, and long service life. Flexible installation: it can be wall mounted, hoisting or seat installed or other ways you like. High-frequency Flashing Light: LED Light Flashing, high luminance, low power consumption. Mini Audible and Visual Alarm: This alarm device is combined aural and visual alarm,giving warning signals through alarm sound and flashing light to make the emergency situations known. Specifications: SD Card: Not Support Volume:110dB Power voltage: 9-30V Trigger mode: power-on play Play mode: single track Built in horn:10W Size: 22.0*9.0*11.0cm/8.7*3.5*4.3in Package Weight: 938g/33.1oz Package List: 1 * Horn Siren 1、Built in 10W horn: give 110dB alarm sound when be triggered. 2、Baking finish steel plate, cold rolled steel material: Waterproof, dust?proof, sturdy, and long service life. 3、Flexible installation: it can be wall mounted, hoisting or seat installed or other ways you like. 4、High-frequency Flashing Light: LED Light Flashing, high luminance, low power consumption. 5、Mini Audible and Visual Alarm: This alarm device is combined aural and visual alarm,giving warning signals through alarm sound and flashing light to make the emergency situations known.