To open the key, just pull the rabbit's head. Once connected to your computer, you do not see that little head on the edge. The small small chain attached to the rabbit ear retains a small square accessory that fits into the body, instead of the head: so you do not risk losing the body when you plug the drive into the USB port.
Its capacity of 4GB is fine with me. I find insufficient well 2GB, 8GB and a bit too much for me. I am delighted to take my rabbit with me, it is rather fun in an austere environment such as office or library. I also gained followers who bought the little bear in the same collection, and Taz from Looney Tunes.
In short, a product that I recommend!