2. Best Headset

The Eini Zigen usable as a headset models are the Jabra BT200 / 250 (nearly identical) and the estimated here Wave.

Positive
On BT200 / 250 I had even installed a foam - which is the Jabra Wave already supplied and provides good services as expected regarding the suppression of wind noise.
The Wave of the battery lasts a long time - over 1 week with daily use (I guess on average 30-60 minutes / day)
Also, go on the bike / walk when used as mechanical filtering of wind noise
Sits comfortably on / in my ear
Ease of use - all buttons are easily accessible and operated - solely for Off & Switch on (slider) I took the HS at the beginning of the ear.
Use with 2 phones works perfectly - a call comes on 2 phone during a call, obtains a call waiting tone and can switchen by call answer button.
Can be applied with one hand - if the rubber stopper is set correctly.
Call handling when switched HS: The connection to the phone takes about 20 seconds to => to accept a call by HS must be enabled this relatively quickly. Positive: Even during a call can be easily geswitcht phone to HS - by simply turning on the HS.

Negative
The Wave has (unlike the BT200 / 250) an electronic noise suppression. This works like with all devices that I know badly with this function. When trying striking noises (squeaking stairs, train / subway ...) to filter is also a part of speech information lost. The simple foam windscreen would have been sufficient.
Can be loud: If I call in a quiet area and my interlocutor speaks louder, it's tw. too loud for my ears.

Conclusion
Am satisfied - I'd probably buy back's - unless it comes a similar model without the electronic noise reduction gimmick out.