Feature: 1. Powered by Battery: Battery powered gas detector alarm, powered by 3pcs 1.5V AAA battery( Batteries are not included), controlled by a low power CMOS microprocessor. Portable and easy to install, no socket required, unaffected by power failure, can be installed anywhere. 2. Clear Alarm: High volume alarm sound output, which is more than 85dB. When the leakage concentration gets up to a certain level, the alarm can quickly identify the gas and emit an alarm of 85dB to avoid dangerous accidents and ensure property safety. 3. Reliable Working: Adopting high sensitivity, high stability, and long life small power consumption chemical sensors, it has excellent anti alcohol interference performance. 4. LED Light Alarm: Under normal circumstances, the LED indicator light flashes once every 40 second. When giving an alarm, the LED indicator light quickly flashes and emits an alarm sound. 5. Easy to Install and Wide Use: The alarm is equipped with installation accessories, and can be completed by drilling holes in appropriate positions. Used in bedrooms, kitchens, living rooms, and any other areas with fire hazards, simply press the button to quickly test the detector or mute any error alarms. Specification: Item Type: CO Detector Material: ABS Battery: 3 x AAA battery, shipped without battery. Detection Range: 000-999PPM Sensitivity and Time: 50ppm, alarm within 60-90 minutes. 100ppm, alarm within 10-40 minutes. 300ppm, alarm within 3 minutes. . Package List: 1 x CO Detector2 x Screw2 x Wall Plug1 x Sticker1 x User Manual