Zuphil9 years ago000Operation of an "earplug": is it possible to operate only 1 unit at a time, or did the units only work properly when operated simultaneously?Show in original language (German)jepper009 years ago000with a double tap, the right plug can be used as a standalone (handsfree). but not the other way round. in the left one are the activity trackers (pulse measurement etc.)Show in original language (German)Comment