kidde nighthawk carbon monoxide detector kidde nighthawk kidde nighthawk plug-in carbon monoxide and explosive gas detector kidde nighthawk smoke and carbon monoxide alarm kidde nighthawk gas detector kidde nighthawk carbon monoxide alarm kidde nighthawk kn-coeg-3 kidde nighthawk combo smoke and carbon monoxide alarm kn-cosmxtr-b kidde nighthawk plug-in carbon monoxide detector kidde nighthawk plug-in carbon monoxide alarm