I buy two of these . in the middle of the night I wake up and hear a strange whir noise from one of they . I have to remove the battery to fall back asleep . brief description - they be considerably bigger than I expect . the alarm switch be on the side which mean it be possible turn it on or off while reach for the light button . light be bright . if you enable the sensor , the light will turn on when it get dark . I do not want this feature but , if you want a bright light on all night , it seem to work fine . at first , they be absolutely silent . the quiet one seem ok . the other will be return .