Junk battery. I have bought both v1 and v2 of this product and both suffer from the same battery issue. I couldn't last more than a week (using only 7-10 minutes 5 days a week) before the v1 started beeping low battery. Problem is, there was no advance warning - after it started beeping about low battery, you only had about 5 minutes or so left. Once the noise started, it was so frequent that it was almost impossible to use until it recharged. Version v2 never caused battery drain. Warning, next time I use it, it will just die. The sound quality is decent, but the battery kills the usefulness of this device. Revain have their own brand Revain Basics (little black box) which is phenomenal. It's durable, waterproof and I haven't had to charge it yet. I would definitely recommend the Revain version as this one.
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