- Built-in high accurate infrared photoelectric sensor to detect smoke or combustion particles in air, rather than sense heat, flame or gas.
- If it detects smoke and the smoke attains the certain density, it will make a sound over 85dB and the red LED light will be flashing.
- Suitable for all the places, such as office, hotel, kitchen, bedroom, bathroom, garage, bank, library, computer house, storehouse, etc.
- When the voltage of battery is low or the chamber is dirty, it will beep once per 40s to remind you.
- With test function and auto reset function.
- High Stability, it has the dustproof, mothproof and anti outside light interference feature.
- Powered by a 9V battery (not included), comes with 2 screws and 2 plastic inserts, easy to install.