Condition: 2.4GHz wireless mouse with bow bridge design Arc Mouse folds up to 60% of fully expanded size when you are travel Scroll up and down directly without losing hands Alkaline battery: AAA x 2 pieces (battery not included) Color: purple Material: ABS Compatible with / Windows 8 / Windows 7 / Windows XP / Vista Optical positioning, precise and Working range: 8 to 10 m Two button and a scroll wheel, very practical Built-in USB Nano receiver Durable Comfortable wheel design Plug and Play, no need to install additional drivers gliding feet Resolution: 1600 Ergonomics: support Open Size: . 113 x 58 x 28mm / 4.45 x 2.28 x 1.10inch Folded Size: about 78 x 58 x 30mm / 3.07 x 2.28 x 1.18inch After folding, the mouse automatically closed and can be conveniently carried in your pocket. Note: If you use the mouse, plug the supplied USB receiver. The package includes: 1 x Wireless Mouse Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.