It's a very good product. I've been involved in sound technology for a long time, but I haven't heard such an excellent sound in the $ 10 category, even with a wired earphone. Very good stereo stage picture, very good details, a bit of a "v" shaped frequency tuning - which doesn't hurt at all -, excellent phase flow, and the earphone's sound is not tiring in the long run. Stable, fast bluetooth connection, convenient use. The earbuds tips are good quality, if you feel like experimenting with other types (memory foam, etc.), maybe even better sound can be brought out of it.I don't know the operating hours and phone calls yet, it may be as much as what is in the description.The powerbank feature can also be a quick help.I can recommend with a calm heart, very good buy.