Buy to use a Bluetooth headset with my MP3 player. This works fine. It comes with the charging cable (USB) jack male / male cable and a jack adapter male / male. This product seems more solid than the transmitter purchased decrescendt there is little because the cable linking it to the mp3 player is removable. The connection is made easily with a Phillips SHB9100 headset. A view on the long-term durability.