[. . . ] [. . . ] Two mouse buttons and a wheel combine dependable performance and affordability to control the PC efficiently. ARCTIC M111 Specifications: Sensitivity: Tracking engine: Connector: Typical power input: Cable: Weight: Dimensions: 800 dpi Optical USB 5V, 10mA 1. 8m, Ø1. 8mm 76g 110L x 64W x 38H mm ARCTIC M121 Specifications: Sensitivity: Tracking engine: Connector: Typical power input: Cable: Weight: Dimensions: 800 - 1000 dpi Optical USB 5V, 10mA 1. 8m, Ø1. 8mm 66g 100L x 68W x 38H mm [. . . ] [. . . ]