ERGONOMIC TRACKBALL MOUSE: With the smooth and precision trackball, you no longer need to move your arm for the movement of the cursor. Your thumb will control the cursor instead. It will effectively reduce fatigue and strain for your wrist and arm BLUETOOTH & 2.4G WIRELESS CONNECTION?This ergonomic wireless trackball mouse has dual connection modes BT 4.0 and 2.4G wireless (USB Nano Receiver stored in the mouse bottom), you can connect up to 3 different devices at the same time, switch freely between Android, tablet and Mac with just one button RECHARGEABLE WITH USB-C PORT: The Bluetooth Trackball Mouse built-in 600mAh lithium battery. No need to change batteries. It can last 1 month per one full recharge. Please remember to turn it off if you do not use it for a long time 3 ADJUSTABLE DPI: 3 adjustable DPI level 1000/1600/2400, easily change the cursor sensitivity depending on your activity. Provide a fantastic using experience of fast response, smooth tracking, precise movement WIDE COMPATIBILITY: Universally works with Windows, Android, Mac OS PC Laptop Desktop, etc. Bluetooth mode works with Windows / Android / MAC OS system, won’t occupy any USB port. 2.4GHz mode works with laptop, desktop or any device with USB port, simply plug the USB receiver into the USB port and you are ready to go