This is a truly ergonomic mouse, vertical design,natural stretch of the wrist; arched back combined. 
With curved mouse ring design,contoured to hand in most natural state,to reduce hand fatigue. 
Ergonomically design,ease the harm of palm joint or muscle for long-time using mouse. 

Specification:
DPI:1600DPI
Color:Blue/Black/Grey/Purple
Model Number:TJD-01
USB:USB3.0