The kidde 5colsb carbon monoxide alarm continuously monitors for the presence of deadly carbon monoxide co in the home providing a constant protection against the effects of this deadly gas the 5co features two leds the red led illuminates when the alarm has detected co in the atmosphere and 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 convenience it is also ideal for use when on holiday and in rente