To disable the clicking sound on the Rollermouse Red Wireless 4.0 please do the following:
Press and hold DPI (cursor speed), then while holding this down click once on the scroll wheel. - Its important that you click and don’t scroll.
Now you have activated the function.
While still holding DPI down, scroll upwards on the wheel, until all LED’s are blue at the same time.This disables the sound entirely.
To enable the sound, repeat above, but scroll down till only 1 LED lights up at a time, then adjust the sound level accordingly.