High Sensitivity 360 Degree Perception: Unique structural design and advanced photoelectric labyrinth, real-time monitoring of smoke presence, detection of visible particles faster than ionization alarm. Battery Lasts 10 Years: This fire detector is equipped with a low power 3V lithium battery for an incredible life of up to 10 years for smooth operation. Operation test button: This smoke detector is equipped with a function test button for function test. Thanks to this, the alarm detector can be reset after an alarm or returned to monitoring mode. and Easy to Install: The outer case of this smoke detector is made of ABS + PC plastic, which is eco-friendly and flame retardant. Easy to put up and easy to use. With 10 years of quality and lifetime customer service. Comprehensive protection for your safety: Smoke detectors have an integrated buzzer. Once the danger of smoke and fire is detected, the red LED indicator will flash immediately and an alarm sound of more than 80dB will be output to quickly remind you and your family.