The point of a wireless mouse is to not have wires physically attached to the mouse to allow a greater degree of freedom of movement. You obviously have to have power going to and data coming from the base station. The mouse has to be recharged, and the base station has to get the data to the computer some way! Wireless mice with dongles (think Logitech V500) have no wires, since the receiver is just a USB dongle. However, you can't recharge them, as they use alkaline batteries as opposed to Li-Ion like in the MX 700, 900, and 1000.