This is the original Glider the REAL Glider Capo by Greg Bennett.  Beware of all the cheap knock offs on eBay and elsewhere.  

ROLL IT WITH YOUR THUMB 
For uninterrupted playing and seamless key changes, simply push or pull The Glider from fret to fret with your thumb on the back roller.

ROLL IT WITH YOUR PICK HAND 
With your hand, just simply pull it down or push it up the neck to the desired fret. The Glider rolls smoothly and the guitar stays in tune!

EASY ON - EASY OFF 
The Glider opens easily to install on your guitar neck.

STORE IT OVER THE NUT 
When you're not using The Glider, simply store it by rolling it up over the nut. When you need it again, roll it back out.

https://www.youtube.com/watch?v=IYs3b0VP24U