???Sound and light alarm???115db loudspeaker with light flashing alarm, flashing frequency 90-150 times/minute, can give people a timely warning. ???Energy saving and environmental protection???High brightness LED light emitting tube, 50000 hours of service life, low heat generation, energy saving, no maintenance often bright. ???Easy installation???This machine does not come with a plug, just need simple wiring, you can install it to the desired place at will. The bottom is fixed with a metal frame and triangular screws, easy to install and firm. ???Wide application???It adopts premium material, which is dustproof and moistureproof. It can be widely used in schools, factories, communities, ???Note???This alarm is a basic model, the volume and tone cannot be adjusted, if you need more functions, please refer to: B086DKJH9B, B0861YLZFX. ???Or contact us at any time)