First, a note to all who claim the device is not coupled to: when the machine on the smartphone, etc. is connected: Press the LONG AS button until the connection is established. Then it will come!
The sound is okay, I hear anyway merely audiobooks. The battery lasts me about 5 hours and is recharged pretty quickly. The shipping took 2 weeks, which was not a problem (China Import). The price of this unit is unbeatable.
