This also allows me to use a locking 5/8" hinge pin as that will not work with the threaded extension. Going to cost me almost as much as the shoe for return for a mistake this company made. Feels good to wear and secured even on the go but sound quality could be better. Would have to hold it a certain way to work, but it has now stopped working completely. It is as easy as plug and play ! I like everything about them and more This cart was easy to put together and is very sturdy. Had to watch a video of a competitor for step by step. Superb. Great for traveling and quick shaves.