Instruct: Classify Amazon reviews into positive or negative sentiment
Query: NOT SURE WHY YOU WOULD BUY THIS!

Main unit is battery OR electric not battery back up. If you set the clock under battery and then you plug it in you lose all of your information. The alarm clock is nice but without the battery back-up you can't depend on it. The projection part only works when you hit a button on top of the main unit. It then only shows the time. If you hit it again you can see the inside temp, hit again the outside temp. Not sure why you would want a projection clock if you have to walk over and hit a button to see it displayed. Haven't bothered to insert (waste) batteries to even try out the thermometer part. VERY DISAPPOINTED!!