The transmission characteristics:
Pairing with my Bluetooth receiver on my system worked perfectly. This is a Harman Kardon BTA 10 Bluetooth receiver.
And more importantly, it works again every time properly, when I turn on both devices.
The transmission is flawless. Is sent over about 3 m.
The sound is okay.
I can not complain about the battery life. The battery has so far never empty. I invite the device periodically with my iPod. That is, it transmits a few hours of music without problems.
I highly recommend this device.