Instruct: Classify Amazon reviews into positive or negative sentiment
Query: To be avoided

When it works, it works very well. Unfortunately, it seems to spend most of its time trying to pair with other Bluetooth devices (mobile phones?) resulting in numerous breaks in the music. Sat quietly with no-one near you it is excellent, but on a crowded train or walking down busy streets it is awful. The constant breaks in playback make it unusable. I know it's not the Sony Bluetooth headset, because if I pair them to my phone or Mac I have no issues with breaks of service. Even on busy trains.Another gripe is the battery; it lasts about 6 hours, but is very poor at keeping the charge. If you don't use it for a few days you will need to charge it up again as the battery will be flat. And yes, I always turn the unit off when I have finished with it - the battery just runs down.