Vertical Design Wired USB 5D Optical 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. Home and Office Use. 5D Optical Mouse. 5V-100mA, On/Off Button, Speed Adjustable. Vertical Shape and comfortable handle feeling. Dimension: L 10.5 cm X 7cm X 10.8cm. Color: Blue Black.