Product Description: It is a type vertical mouse adopting human ergonomic design,and suitable for office. removable palm rest and anti-skidding design on side, protecting your wrist and give you comfortable hand feeling when you working; stable office optical mouse, making your work efficient. Features Vertical Hand-gripping Mode with Removable Palm Rest, comfortable hand feeling; 5 functional buttons (left/right buttons, forward/backward buttons, roller) ; Skin-like metarial on side, to enchance user experience; Type:Wired 1.7m; stable office optical mouse; Specifications Optical wireless mouse; Operating force: Left Key: 70g ±15g, Right Key: 70g ±15g, Mid Key: 70g ±15g,Encoder: 30±10gf/cm; Life time: Left Key: 5 Million, Right Key: 5 Million, Mid Key: 1 Million,Side Key: 1 Million; Interface: USB; Size : 100mm*75mm*80mm ; Compatible for Windows XP/ 7/ 8/ 10 Mac OS;