Features: Built-in carbon monoxide sensor, with carbon monoxide gas leakage alarm. Exclusive smoking intelligent algorithm, has high sensitivity, no false alarms and strong anti-interference. Applicable for Tuya Smart or Smart Life APP, and can connect to your home wifi no matter where you are. It will send an alert notification to your phone in the first place when in need. Electrochemical sensors with loud 85 alarms. Safer and reliable in use. The battery lasts for 2 years in normal use. And powered by 2 CR 123A battery. (Built-in battery) The alarm sound mode is a pulse four-tone short alarm beep for common alarm and continuous smoking alarm sound. The sound mode is the smoking mode because co and smoke occur simultaneously. In the alarm mode, the red LED will flash. A beep every 30 seconds indicates that the battery is low (need to be replaced) or the device has failed. Green and red LEDs indicate normal operation and alarm statue. Easy to install. The sturdy mounting base makes it easier to mount the detector on uneven surfaces (ie stucco). The mounting base has a large mounting port that accommodates drywall anchors for surface mounting. Can be used in kitchens, bathrooms, barbecue shops, winter heating, etc. Specification: Material: ABS plastics Color: White Carbon Monoxide Alarm Density: 100PPM Smoking Alarm Density: 0.25dB/M Ultra Low Power Consumption: 2 years life (in normal use) Independent Sound and Light Alarm: Alarm volume (> 85dB / 3meters) Standby Current: 26uA Alarm Current: 120mA-130mA Sensitive Distance: 6 meters Angle of View: 110 degrees Operating Temperature: 0 ° C-40 ° C (32 ° F-104 ° F) Working Humidity: 20%-85% Storage Temperature: 0 ° C-60 ° C (32 ° F-140 ° F) Power: 2 CR123A batteries (built-in battery) Package List: 1 x CO Smoke Sensor 1 x Pack of Screw 1 x Instruction Manual 1、Built-in carbon monoxide sensor, with carbon monoxide gas leakage alarm. 2、Exclusive smoking intelligent algorithm, has high sensitivity, no false alarms and strong anti-interference. 3、Applicable for Tuya Smart or Smart Life APP, and can connect to your home wifi no matter where you are. It will send an alert notification to your phone in the first place when in need. 4、Electrochemical sensors with loud 85 alarms. Safer and reliable in use. 5、The battery lasts for 2 years in normal use. And powered by 2 CR 123A battery. (Built-in battery)