I wanted a small atomic clock with an indoor temp reader. There are a lot of small atomic clocks, but most lack the indoor temp, or also have the outdoor temp, which I do not want. I started with a Seiko advanced technology travel clock, which looked perfect when it arrived. Nice quality. Unfortunately the clock never set, even though it appeared to be receiving the signal adequately. After talking with Seiko and the seller, Princeton Watches, it went back and I ordered this. This is my second Ken-tech, and the first one still works fine. This one updated in about 5 min, and that was in the daytime which is rare, because I am quite far from the signal. The on-demand light illuminates the whole screen well. It takes two AA batteries, so no running around for those odd size button ones. It does not come with batteries, so be prepared. Not as attractive as the Seiko, but the build appears solid, it works, and was half the price.