Features: ERGONOMIC TRACKBALL MOUSE: With the and precision trackball, you no 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 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 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 per one full recharge. to turn it off if you do not use it for a long time 3 ADJUSTABLE : 3 adjustable level 1000/1600/2400, easily change the cursor sensitivity depending on your activity. Provide a fantastic using experience of fast response, tracking, precise movement WIDE COMPATIBILITY: Universally works with Windows, Android, OS PC Laptop Desktop, etc. Bluetooth mode works with Windows / Android / OS system, 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 1. and precision trackball (With the trackball, you t need to move your hands when you work or play, so there is no fatigue with your hands) 2. 2.4G USB Wireless and Bluetooth Dual-mode 3. Ergonomic design 4. High sensitivity with 3 levels 5. Rechargeable with USB C port 6. Connecting up to 3 devices simultaneously Specifications: Working Distance: 10m level: 1000/1600/2400 Click life: more than 3 million Lithium battery capacity: 600mA Material: Plastic colour: Package Contents: 1 x Trackball Mouse Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.