Feel safe in the knowledge you've got this 10 Year Digital CO Alarm Sealed Battery. This digital CO alarm features a 10 year sealed for life lithium battery with an advanced electrochemical sensor, calibrated and tested in CO gas. The intelligent algorithm increases the sensing rate on detection of a low carbon monoxide level as well as emitting a pre-alarm warning, while the memory function gives an indication of any previous alarm activations. This sleek alarm has a multifunctional display to provide visual instructions and the LCD lights vary depending on the event type. At night, the LED heartbeat intensity automatically reduces and a silence function can be used for low battery alerts until the morning. This alarm monitors your environment with a temperature and humidity alarm warning for prolonged dangerous conditions. Advanced diagnostics support is available via cable, alongside a quiet test function so you can relax knowing your alarm works, sounding it at a lower volume than usual.