Features: *Exclusive smoke intelligent algorithm, high sensitivity, no false alarm, strong anti-interference. *Anti-light, Moth-proof, Dust-proof, moisture-proof, High stability. Low power CMOS microprocessor, effectively extend battery lifespan. *Once triggered, the red LED will flash with loud high volume alarm sound, louder than 85dB. Test Key: With manual test, manual reset function. *Perfect full buckle patented structure, anti-dismantle bracket, easy to install, clean and replace battery. No wiring needed. *Low Battery Alarm: When the voltage is lower than 7.0V0.5V, detector buzzers once every 1 minute with a drop sound and flashes once. Discounted at only: US$ 48.26 
