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, light will flash with loud high volume alarm sound, louder than 95dB. With Test Key. *Perfect full buckle patented structure, anti-dismantle cover, easy to install, clean and replace battery. No wiring needed. *Low Battery Alarm: When battery voltage is low, sound prompts to remind users replace battery. Discounted at only: US$ 18.04 
