Super idea, disastrous implementation

A Bluetooth adapter with built-in microphone to which you can connect a high-quality headphones, a stereo system, powered speakers, etc., and thereby not only can output music but also a speakerphone has.

In conjunction with the hi-fi system and a Sony headphones I had hoped for wireless music and a very good handsfree / headset replacement.

As you unpack the first negative surprise: Instead of a Micro-USB connector, a 1.5 mm barrel connector is used for charging. Is the USB cable Hohlstecker lost or it is not being there when the battery is empty, the Bluetooth adapter is just a useless piece of plastic - in spite of all available Micro-USB cable.

When first trying out the next negative surprise: During charging, the adapter has NO function. So either charging or use, but not both simultaneously. For permanent stationary use with a permanent power supply, therefore, absolutely useless. After each charging process you have to remove the plug, press for 2 seconds on the Menu button and wait for 10 seconds to have Bluetooth adapters and smartphone (Google Nexus 4) again.

And the "good" conclusion: The audio output is somewhat distorted. The microphone sounds but as tinny distorted that the interlocutor little understood - even at 15 cm distance from the microphone and 20 cm distance between smartphone and Bluetooth adapter.

Conclusion: Cheap, but still not worth the money.