No funcionaba. I am sending them back and I may try the smaller size 4/5 this time. Everything was pre-drilled properly and the only thing I had to do was put two screws in to mount it. I couldnt wear them anymore. So buyers might want to order a half size larger. Amazing Spice Rack and free refills for life. They were simply horrible! This was briefly improved by a firmware upgrade but has already come back somewhat. The base is rather small in size, which is nice, and the headset looks and feels very nice in quality. The first pair just stopped turning on after a couple months.