I've been buying the One Outlet Timer for about twenty years. I have three in use around the house and always keep one on hand as a spare. I live in Southern Arizona and use them year around. I only have to change the batteries maybe twice a year. I have purchased at least a dozen of these timers and only had one fail before the six-year warranty was up. I contacted the company, and they sent me a new one after answering a couple of questions. I will continue to buy this product. GREAT PRODUCT, GREAT SERVICE!