I picked up these retractable cables at a business conference. I believe that they are handy for charging.
These chargers are for the USB Mini-B (5-pin) connection; the other end is the standard USB-A. Since I don't have any electronics needing a Mini-USB connection, I've never used them.
One of these units stops in increments as you unfurl it; the other does not.
If you are unsure if these will fit your electronics, then please don’t buy them. I feel certain that not many electronics today use this connection, but these may prove useful to the few still around. Thanks.