Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works well, but battey life is disappointing

This is a decent, low-priced product. It is so tiny and light that it is great for use when walking/jogging/cycling. My only complaint is the battery life. Using 192kbps WMAs, battery life was a disappointing 2.5-3 hours. Using 64kbps WMAs increased battery life to 8+ hours and allows for a LOT of songs in 1GB. With ear buds and street noise, sound quality isn't great, so trading lower bit rates for longer battery life is acceptable.