ADJUSTABLE ANGLE: Unique detachable risers to customize the angle of the mouse from 0 to 10 or 20 degrees to minimize strains on wrist and arms. WIRELESS DUAL MODE: Switch between two devices via Bluetooth or wireless 2.4 GHz connection.
The trackball only actually connects to and controls the mouse 25% of the time, otherwise it's just not moving. VERY FRUSTRATING at the poor design and execution. I am going to use it as a paperweight or maybe use it to knock cans off the fence.
Shipping was fast, plug n play, has the feel and quality of a more expensive model. I tried it on a whim. I did not expect to get the quality in this unit.
PS: I'm a retired Computer Tech.