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High Sensitive CO Alarm Detector , DC9V Carbon Monoxide Detector Description: This Carbon Monoxide Alarm is effective for detecting any buildup of carbon monoxide, also known as CO gas, in your home or office. The feature of your CO gas alarm includes: * Self-Checking function * Low-battery warning indicator; * Self-Test Button to verify operation * CO sensitivity meets EN50291 or UL2034 * Easy to install, move and maintain * 5 years limited warranty for the CO-sensing unit;