this clock work for I because I have poor vision it be larger than most small portble alarm and it have black number on white . because I be a insomniac I like a clock close to I by my pillow . I like the brightness of the face and the fact that it have a good light by tap on top . however if you want a clock that keep good time this be not it . it lose about 5 minute during the day average and 10 at night , probably because I tap the light at least once . the exact time do not matter that much to I in those circumstance because its easy to just turn the time knob in back and reset it .