Kidde carbon monoxide alarms 710 year sensor kidde 7coc this carbon monoxide alarm from kidde has been designed to provide a constant protection against the effects of deadly gas in the home equipped with a host of excellent features including two bright leds the red led illuminates when the alarm has detected co in the atmosphere while the green led confirms that dc power is present the alarm can either be installed on a wall or just placed on a tabletop or shelf for added convenien