The Microsoft Memory Mouse 8000 fuses 2 computer related devices together - a memory stick and a specifically designed notebook wireless mouse. The mouse's transceiver doubles as a 1GB USB memory stick, thus only requiring 1 USB port for the function of 2. The mouse itself is designed a little differently than typical mice with a more rounded body. The mouse can operate in both 2.4GHz and bluetooth protocols. It is a rechargeable mouse that you can actually still use while it's recharging.