- Ergo Index Finger-operated Trackball: Compared with traditional thumb-operated models, ProtoArc EM03 finger-operated trackball mouse, equipped with a large 44mm trackball, encourages better ergonomics, full arm movements and neutral wrist posture.

- Bluetooth & 2.4G Wireless Connection: PLUG and PLAY. EM03 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.

- 4 RGB Lighting Mode: You can adjust 4 RGB (Flow, Breath, Constant, Wave) colour effects by one button. NOTE: The RGB backlit also can be turned off by clicking the light switch button, which can save battery power for the mouse.

- Rechargeable Battery: Features built-in 930mAh lithium battery. It can last 1 month per one full recharge with the lights off. Remember to turn it off if you do not use it for a long time. Note: it will enter auto sleep mode if you don't use it for a few minutes to save battery. The mouse will enter working mode again by clicking any button.

- Noiseless Clicking & Adjustable DPI: Smooth frosted surface and quiet clicks can bring a better user experience and free your worry about bothering others and keep you stay focused while working. 5 DPI levels (200/400(Default)/800/1200/1600 DPI) allows you to change the cursor sensitivity easily for more precise tracking. DPI can be changed by pressing the scroll wheel and the right button simultaneously for 5S.

Note: All keys are not programmable. The back and forward buttons are not compatible with Mac OS system.