Kidde brand smoke + CO combo detector. It's about a year and a half old, but it's been sitting in storage for about that long, and still works well. (I'm only getting rid of it because my hallway is too close to the main bathroom for a smoke detector, and it goes off every time I shower.)
Including mounting bracket and equipment (except for one screw anchor, which is currently lodged in my wall), the original 9V battery, and the instruction packet.
Fair Offer Policy applies
Smoke + CO detector (King of Prussia)
This offer has been gifted to someone and is no longer available.