How to Add Weights
One of the unconventional features of the Proteus Spectrum is the ability to tune the device's weight. Adjusting the weights is an extremely simple and straightforward process. Next to the thumb rest, there is a small piece of black plastic. Push down gently on it, and a magnetic panel will detach from the back of the mouse. You can add up to five magnetic weights (included) into this compartment. Just put the cover back on when you're done. That's really all there is to it.