DBPOWER USB2.0 Wireless Finger Handheld Mouse Mice Trackball Mouse for Laptop PC

Product description
Description:
* Plug and play, easy to install
* Wireless, with trackball, cool
* Made of chart and won't block your of operating space
* Scrolling function can be controlled simply by your thumb
* USB 2.0 interface, plug and play, no software needed.
* Special design, can prevent the damage on your wrist and muscle, significantly reduces discomfort for Arthritis and CTS suffers
* Easy to use - left or right hand, or between two bent
* Perfect for laptop and desktop
* Place end of index or middle finger on trigger button & thumb on roller ball
Features:
* Suitable for tablet PC & Laptop & Desktop computer
* USB port, USB receiver is included (like the picture in the description)
* Four Group Dpi: 400,600,800,100
* Powered by a AAA battery (not included)
Package Content:
* 1 x Wireless Finger HandHeld USB Mouse Mice Trackball Mouse
* 1 x Receiver
* 1 x User's Manual