Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Clever little device!

I purchased this product for use in my piano course. I would highly recommend it to music makers at any skill level. It can count in different meters, you can tap in your rhythm to match something you're listening to, and it does tuning as well. Volume on the turn wheel ranges from silent to audible over the piano. I haven't tried the earphone jack because I haven't had to. Great features, great value!