As other people wrote here, the firmware out of the box does not work. When you press the side buttons, the entire mouse is cut off. Write to groups or email to get the firmware is useless. They don't answer. Thecommpany seems to be dead. They don't even have a hotline. It's a pity people don't have a firmware file for the mouse. The mouse itself is excellent, only the HIPERcommpany itself strangled this model. .Could still get to this firmware. Enjoy.