Doorbell with emergency button function Doorbell and emergency button function is the alarm also has doorbell and emergency button function Small appearance big volume 0-15 alarm volume at will, the maximum alarm sound >80 dB The appearance is compact and elegant,simple and generous To install environment requirement is not high, have adornment effect again Simple operation and setting,the whole process of voice prompt Grid honeycomb design,high temperature resistance and good heat dissipation effect, Manufacturer: TRDEWR