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Equipped with an electrochemical carbon monoxide sensor, a test switch, an 85-decibel horn, and a red LED power indicator, this carbon monoxide detector warns you to the presence of carbon monoxide. Hinged Cover Design - Allows for fast, easy installation and battery replacementSilence Feature - Silence unwanted alarms. Test alarm with the same button.Tamper Resistant Locking Pin locks alarm to to base to prevent removal of battery9V alkaline battery included10 Year CO Sensor/10 Year Alarm Life10-Year Limited Warranty