85dB Smoke Detector, 3m range, wireless, 2-way communication, photoelectric sensor, test button, battery life 18 months
This Photoelectric Wireless Smoke Detector is designed to sense smoke that comes into the detector chamber. It does not sense gas, heat, or flame. The working principle is when the smoke detects a certain density of smoke, the alarm of the smoke detector will sound (85dB) and in the meantime, the detector will emit the signals to the associated devices for further execution. Its battery life is 18 months.