dopts AVAGO optical sensors, precise positioning, stable performance. Button rated at more than 10 million clicks. High - precision: 1000 dpi. OS compatibility: Microsoft's Window 98, Me, 2000, XP, Vista, 7; Linux; Apple's Mac OS (Mac 9.01 and above version). Certificates: FCC and CE. Safe and environmental friendly (RoSH, PAHs and REACH standard) Material: ABS Available colours: orange, green and blue Dimension: 10.4(H) x 5.4(L)cm