We needed a new smoke detector because the one we had was to close to the kitchen and always going off. My husband put up the ARIKON Battery Powered Smoke Alarm very easily and it was up within 10 minutes. The 9 volt battery is included. It has a much nicer design than others I have seen and had.
It has a test button that tests the unit's electronic circuitry horn and battery function. He mounted it to the ceiling and it looks more like a light then a smoke detector. I received this smoke alarm complimentary in exchange for my unbiased review and opinion. All opinions and words are my own.