Must mount on stud in order to hold the weight of the bike. These are also affordable with decent sound quality. I also love the peach/coral color I purchased mine in. Aber dann kommt für mich das absolute ?no go?, eine Lautstärkeregelung ist an den Ohrhörern selbst nicht möglich, diese muss am Ausgabegerät erfolgen, da muss ich ganz ehrlich sagen, dann kann ich auch wieder ein Kabel dran machen. El precio está regular esperando sean de buena calidad. I almost bought a cheaper version to save money but I decided to go with the more trusted name. Plus some blank ones with the white marker made everything get a clear label. I recommend planning your system very carefully and allowing for couplings, fittings etc. Of ALL the technological devices I own and have EVER owned for that matter have been a "normal" (USB A type A male, micro USB or USB-C) connector and easily cross compatible with basically any USB port. Will see if I can still try returning them, otherwise they will have to go into the dumpster.