The short ball bungie fits around the handle of the XA-10 and can be tightened by pushing down on a plastic collar.
The holster clips onto your belt. The backing is rubberized so it won't easily slip off your belt.
Drop the ball end of the cord into the holster and you're good to go. Unlike the Spider Holster system, there is no locking mechanism (what do you expect for less than $10?). As long as you aren't jumping up and down or anything, you should be fine.
Makes it easy for you to quickly get your hands free when you need to. I've been using this on both my Canon XA10 and XF100 camcorders for this wedding season and it's been working out great.