The neck strap or if you are going to put it in your key chain, you need to be aware of the fact that it is the pen drive cap that attaches to your chain leaving the actual usb component to fall off and get lost. Other manufacturers have the key chain attach to the pen drive so that you don't lose it. The second problem that I had was that my data on it got corrupted with no reason. Had to format it and lose all my data. Possibly a better option is the TOSHIBA pen drive which is better and available in smaller size, aluminum case and much more sleek and fashionable. I believe that this product just relies on the fact that it is a "SONY" to sell but it doesn't have any other advantage.