[Thumb Control Trackball Mouse] - Move the cursor by simply turning the trackball with your thumb, it is very suitable for use in places with small desktop spaces or uneven surfaces [Ergonomic Thumb Design Mouse] - Scientifically fit hand design, keep each thumb in the correct ergonomic position for a more natural, comfortable hand position and less muscle strain [2.4G Wireless & Bluetooth Mouse] - Connects up to 3 devices via Bluetooth 4.0 + Bluetooth 4.0 + 2.4G wireless, 1 click to switch from the devices easily [Type-C Rechargeable Mouse] - Equipped with a built-in battery with Long Life, can be recharged super fast with the charging cable included [Noiseless Clicks Design Cordless Mice] - Rubber buttons ensure silent clicks are not bothered by annoying clicks and bring a comfortable touch feel [3 Adjustable DPI Levels] - 1000/1600/2400 DPI optical tracking technology allows you to easily change cursor sensitivity which would be easily shifted according to your daily working requirement [Wide Compatibility Rollerball Mouse] - Bluetooth and 2.4G wireless connectivity function make this mouse supports almost all Bluetooth-enabled devices or devices with USB ports [Maintenance Tips ] - It is normal for the trackball to become unsmooth after using it for a long time, please try to eject the trackball from the back of the mouse and clean it with a glasses cloth.