Carbon monoxide detector alarms continuously monitor carbon monoxide levels to your family's safety. Powered by 3*1.5V AA batteries (not included), portable and easy to install, no socket required, not affected by power failure, can be installed anywhere! Fast and Accurate Detection: The carbon monoxide detector has a built-in advanced electrochemical CO sensor that provides high-precision alarms to quickly and accurately detect carbon monoxide levels. When the carbon monoxide concentration exceeds the specified value, an alarm warning of more than 85 decibels will be issued. To complete protection, be sure to place one on every floor and in every bedroom of your home. LCD DIGITAL DISPLAY AND LED INDICATORS: Easy to use with a test/reset button, red LED flashes and a loud alarm mode sounds when dangerous levels of carbon monoxide are detected - 85 dB loud with LED flash alarm. Sensitive Carbon Monoxide Detector - Quickly detects dangerous carbon monoxide levels, giving you peace of mind to protect your family. Features advanced sensor technology, fast response time and easy installation. Keep your home safe with our reliable carbon monoxide alarms Carbon Monoxide Alarms for Every Environment - Our reliable carbon monoxide detectors are perfect for homes, offices, garages and more, ensuring total protection against carbon monoxide threats in the spaces that matter most. Alarm standards: 50ppm, alarm within 60 to 90 minutes; 100ppm, alarm within 10 to 40 minutes; 300ppm, alarm within 3 minutes. Note: When testing the detector, do not use gas to blow directly into the hole. Colour:Photo Color Material:plastic Package Contents: 2 x detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.