"Mini USB" refers to a small type of USB (Universal Serial Bus) connector that is used to connect electronic devices like cameras or smartphones to computers or power sources. Full definition
On the bottom edge of the device there's a reset button, mini USB port, headphone jack, and power button with LED light. (the-ebook-reader.com)
If you have a play - and - charge kit, you can use the lengthy mini USB cable it comes with. (thisisxbox.com)
This is a great little set that includes the socks, 2 lithium ion batteries, and 2 different chargers: an AC charger and a dual mini USB one. (geekwrapped.com)