This small gadgets will alert and warn people stay far away from danger field when it detected smoke‎.‎ This product named Photoelectric detector ‎(‎hereinafter called detector‎)‎ detects the smoke by a couple of infrared diodes‎.‎ The principle of detecting is granule in the smoke can reflect infrared light‎.‎ Infrared diodes are placed in the special chamber‎.‎ The chamber can shield external light‎,‎ but don‎'‎t affect the smoke into it‎.‎While have no smoke‎,‎ the diode can receive very weak infrared light‎.‎ When the smoke entering the the chamber‎,‎ diode can receive more and more light‎,‎ when the smoke attains the certain density‎,‎ the detector can give out alarm signal‎.‎In order to reduce the interference and lower power consumption‎,‎ the emitting circuit adopts the pulse signal‎.‎ The detector adopts the special structure design and ASIC‎,‎ has the dustproof‎,‎ mothproof and anti outside light interference feature etc‎.‎‎.‎The detector is suitable for detect the smoke in house‎,‎ shop‎,‎ hotel‎,‎ restaurant‎,‎ office building‎,‎ school‎,‎ bank‎,‎ library‎,‎ computer house and storehouse etc Product Feature‎:‎    •    Excellent stability    •    High sensitivity    •    Alarm test button for easy testing    •    Loud 85dB audio alarm    •    Low battery indicator    •    Alarm Indication‎:‎Red LED flash    •    Easy to install with mounting hardware included    •    Designed for the fastest possible installation Product Specification‎:‎    •    Sound Level‎:‎ >=85dB/m    •    Power‎:‎ 9V non‎-rechargeable battery ‎(‎Included‎)‎    •    Alarm Current‎:‎