Just like any other wireless mouse, Sandberg Wireless Battery-Free
Mouse pro gives you full freedom of movement without an annoying
cable in the mouse. But this mouse is different from the rest. It runs
without batteries! This means you are completely free from annoying
battery changes which are both time-consuming and cost money as
well as causing damage to the environment. The secret is the mouse
mat from which the mouse draws electricity via electromagnetic
induction through the computer’s USB port. The mouse’s optical
controls ensure optimal precision and the two scroll wheels allow you
to scroll both vertically and horizontally. Software is also included in
which you can programme the mouse’s buttons and fine-tune
movement. English user guide.