Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Sony CD Walkman

I am quite satisfied with this product. Very simple controls, but might be better to have the instructions in a booklet rather than on the cardboard packaging. With the included earbud speakers audio quality is sufficiently good for books on CD. Battery life is quite good (about 15 hours). Battery replacement is easier if you use a small screwdriver to pry out batteries.