Are you looking for a professional, yet CO security alarm? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our professional CO security alarm must meet you needs. It is one of the for you. Features - Color: White. - Material: Plastic. - Size: 6.2 x 6.2 x 2.8 cm. - Alarm sound: 85 decibels - Alarm current: Less than 80mA - Quiescent current: Less than 80uA - alarm: A sound every 30 seconds - Rated voltage: 220V 50HZ. - Power: 2 section No. 7 batteries (not included). - Two universal AA batteries work (not included), no wiring, and can be installed corresponding to gas. - Unique low power consumption design, low power reminder function. - LED display, when the concentration of carbon exceeds the standard, will be accurately displayed on the screen, . - Sound and light alarm, through the air inlet detection, when the concentration reaches the value, it will automatically sound and warning lights. - High sensitivity sensing, high precision chip to avoid other gas interference. Package list: 2 security alarm