Details Main Features - -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 -Adjustable angle design - Unique adjustable hinge allows you to customize the trackball angle from 0 to 20 degrees according to your needs for a more natural; comfortable hand position and less muscle strain -4 RGB lighting mode - You can adjust 4 RGB color effects by one button. Rainbow Streaming Light(Default); rainbow Breathing light; neon; color mixing breathing light. The RGB backlit also can be turned off as you want -Rechargeable & adjustable DPI - the bluetooth RGB trackball mouse built-in 900mAh 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 DPI levels (1000/1600/2400 DPI) allows you to change t