I wanted something small, just to give me the time at night without being bothered by a power source or brightness: I am satisfied! I quickly noticed that this was the button to light, so it is quite easy in the dark to capture this little alarm clock and tell the time before putting it down (before I had to sit in bed to see time shown on the clock radio from my husband!). I did that for a few weeks but I think he will easily last me, it looks good.