Hence why they dont malfunction. Didnt even last 3 months and they fell apart. I dont, so the shoe looked really stupid. After wearing several times, I noticed these shoes are actually HOT inside! Small, portable with surprisingly good sound from such a small speaker. I dont know and always use straight clamps but Ive posted a picture of the hose on a fitting (the twists go up and to the left). Die Schuhe haben mich so überzeugt, dass ich im Angebot gleich ein weiteres Paar auf Reserve gekauft habe. So first of all. I have to say once Im wearing them you forget you have them in they are so comfortable. I would definitely not recommend these.