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• Electrochemical CO sensor;• Sleek design;• 3V lithium power cell;• Power LED & alarm indicator;• Mute/silence button;• End-of-life signal;• Versatile mount--wall or ceiling with easy slide-in mounting bracket;• Peak level memory captures highest CO level detected;• 10-year alarm life with no battery changes for life;• 10-year limited warranty;• Without voice alert;