Wireless photoelectric smoke detector for fire alarm detection, it has built-in wireless transmitter to work with wireless alarm system or smart security cameras. The smoke detector is equipped with 85dB sounder. Once the density of smoke reaches alarm threshold, the detector will not only send out alarm signal, but also make fire warning sound, meanwhile LED starts blinking. This detector is powered by DC 9V (6F22) battery, can last 12 months. Included with ceiling mount bracket for easy installation, test button allows user to check the status regularly, makes sensor enrollment become super easy and fast.