Mice & Trackballs Ergonomic Mouse A thumb-operated Trarckball,don't need to move your hand Rechargeable trackball mouse New Angle,More Natural Browse the WEB Page easily Whisper-quiet Click About this item ERGONOMIC THUMB MOUSE: With the smooth and precise rollerball mouse, 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. Note: The backward and forward button is not fully compatible with MACADJUSTABLE 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 le muscle strain. Note: it will enter auto sleep mode if you don't use it for a few minutes to save battery and click it, the mouse will enter working mode again4 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. NOTE: The RGB backlit also can be turned off by long preing the light button, which can save battery power for the mouseRECHARGEABLE & 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 the cursor sensitivity easily and track more smoothly over a variety of surfacesBLUETOOTH & 2.4G WIRELESS CONNECTIONPLUG and PLAY. This trackball mouse has triple connection modes. You can control three devices at the same time, switch freely between Android, tablet and Mac with just one button. Compatible with Windows, Android, Mac OS PC Laptop Desktop etc