Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not happy

We purchased this for our 12 year old son for Christmas and the minute we tried to show him how to use it, the "low battery" indicator came on and within seconds it turned off, so we can't even say whether it actually works or not, but I sure hope that the odd sized batteries needed to run it are easy to find, otherwise this was a terrible waste of money. =/