Perfect design. Simplicity of popular procedure. Small well studied for travel. This little alarm clock would be perfect if it had a retro discreet lighting continuously powered and at home, with a small smartphone style transformer plugged into an outlet. Indeed, you must press the button on the top, right side, at night, to see the time. (Do not press on the left side if you stop the alarm if the key remains pressed. It is a gesture which is not conducive to sleep. For trips can be satisfied with the battery but you must let the handy at night if you want to see the time.