Universal Compatibility: Bluetooth mode supports Bluetooth enabled devices with Windows / Android / MAC OS system. Easy to pair and connect. Do not occupy any USB ports. 2.4GHz mode works with laptop, desktop or any device with USB port, simply plug the USB receiver, plug and play. (Note: The USB receiver is stored in the battery compartment of the mouse) Bluetooth / 2.4GHz Wireless Connection: With Bluetooth and 2.4GHz dual mode connection, the Jelly Comb wireless mouse can work on 3 devices, connected to two devices through Bluetooth and one device through 2.4GHz USB Receiver. You could easily switch the mode among 3 devices by just one click. With only one mouse, you can switch free to control your 3 devices simultaneously. Ergonomic Design: The wireless Bluetooth mouse provides better support and more comfort for your hands than normal slim mouse. The unique contoured shape seamlessly fits with your palm, allows smooth movement and prevents wrist pain. Greater Functionality: Added back / forward buttons on the left side of the mouse provide great convenience for web browsing with minimal hand movement. (NOTE: The side buttons do not work with Mac OS) High Sensitivity and Silent Click: 3 adjustable DPI levels (1000/1600/2400 DPI) allows you to change the cursor sensitivity easily. Optical sensor allows for quick response, precise movement and smooth tracking. Silent click keeps you stay focused on your work without disturbing others around you.