Offering continuous protection against elevated levels of carbon monoxide, this unit features a 10-year sealed lithium battery for maintenance-free operation. It also contains a sensor that sounds an 85 dB alarm when dangerous levels of CO are detected. And it's self-activating, with end-of-life signals that chirp when it needs replacing. It has rotating AC blades, too, to keep it vertical when plugged in, regardless off electrical socket orientation.
NOTE: Cannot ship to AK, HI, PR, or Catalina.