Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Effective until it malfunctions

This alarm clock is generally effective, with the ample vibrating along with a loud alarm if you need even more push to get out of bed.The problem is the clock unit. It feels cheap, and performs only so-so. It appears as though it was purchased in a dollar store, or at the check-out counter at your local convenience store. You have to push the buttons hard to change the alarm time, etc. The buttons feel as though they have a weak electrical connection. They don't contact unless you really press on them. It is a poor design and cheaply made. Also, it doesn't keep good time.Worst of all, after only 6 months or so, the clock malfunctioned. I woke up to the vibrating puck going off (erradically) and I could not shut it off. Turning the alarm "off" like I do every morning had no effect. I had to unplug the vibrating device. There's one thing that alarm clocks need to be, and that is DEPENDABLE. This one is not.