This is a simple holder designed to hold your square reader, and has a hole at the top for connecting it to a lanyard. This makes it easy and convenient to have your card reader with you at all times at events, not having to remember where you set it down last, or worry about someone walking off with it. The cutout at the bottom makes it so you can ‘point’ the reader toward your customer for them to insert or tap to pay. The open face and back are there to give it a more sleek look, and help make it easier to remove your reader from it, if needed. You can also charge your reader without having it remove it from the holder, if you wish. I printed in TPU, and is a nice fit - I also printed in PLA, and it was a snug fit (but not too tight).