Bests & Worsts Reviews from Amazon

Writing a review because the seller requested it. The reason I hadn't written one anyway is that I live in hope that I'll never have to know how effective this product truly is. All I can tell you is that it arrived promptly, tested well, installed easily, and is smaller than the general smoke detector -- a plus for me as I have brightly colored walls and this allows for a little more discretion. 4 stars simply because while all seems perfectly positive; what can I tell you absolutely unless we start a fire around it?