Intelligently switch among multiple devices The combo intelligently connects to the working device. They pair multiple devices, and switch among them with ease. They simplify complicated cross-platform use and meet multi-tasking requirements. Switch between Bluetooth 3.0, 4.0 and 2.4G The smart switch between Bluetooth 3.0, 4.0 and 2.4 GHz ensures stable wireless transmission. You can still use the combo regardless of USB port shortage or the loss of receiver. Multimedia hotkeys Multimedia hotkeys give you one key access to media player, homepage, volume adjustment and etc. 1300 DPI tracking engine You will enjoy responsive and smooth cursor control with the 1300 DPI invisible tracking engine.