Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't Work

I read the reviews for this alarm and several people said that none of the alarm features worked. I took a chance and bought it anyway. None of the alarm features work. It count down time perfectly well, but the light alarm, and vibrating alarms don't work. The sound alarm is so quiet, you literally have to hold it up to your ear to hear it. Very disappointing.