Most wall clocks in this category are very unreliable when it comes to telling the time over a long period of time. This clock is accurate! Also, the humidity sensor is great for me to monitor the humidity in my garage wood shop where I dry my wood. The second hand moves smoothly and silently. They don't have a quartz movement like other watches where the hand clicks every second. They come with a battery and a mounting screw. The clock is powered by one AA battery. I like it better than watches that use AAA batteries because AA batteries last longer with less frequent battery changes. It should be noted that the image they use for this product is different from what you may receive (update 4th November 2013: the default image has been changed to the correct design which turned out to be my photo). I posted a photo of another design I received. This wasn't a problem for me as it's in a garage but just to let you know if you care. It's good to know that this company cares about accuracy. UPDATE November 4, 2013 1071 hours since a year. I didn't touch it at all; not even for summer time. They are still accurate and the batteries are still working. I have another cheap watch in my office. I've had to change batteries twice in the last year and adjust it three times because of its inaccuracy. I think I'll replace it with one of these Thomas 1071 watches.
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