Instruct: Classify the given Amazon review as either positive or negative.
Query: vibrating alarm clock

I got this for my mother-in-law who is hard of hearing so that she would wake up at the right time, as well as be aware of when the telephone rings while she is asleep. Well, to be brief, this Sonic Alert alarm clock works great! I was amazed at how vigorous the remote vibrating disk works...it really vibrates! The audible part of the alarm is also very loud and functional. Great device.