For better performance it is recommended not to place the receiver over the monitor in order to eliminate signal disturbance coming from the monitor. A person whose computer system’s BIOS setup has options for the A Cool Bluetooth-Maus, Lasermaus kabellos and Wireless-Maus or keyboard needs to make sure they are completely blocked in the settings. A person, who is not familiar with the BIOS, can refer to computer manual for further information or can talk to a computer support provider. So if you have any problems using the sleep button you can make sure that the power management setup in your computer has been enabled both in the Windows and BIOS.