Kazee MR3M2470 Wireless 2.4G 1000/1500/2000 CPI Optical Mouse (Metallic Orange + Black Color) Ergonomic design helps you work longer without discomfort. Non-slip panels for extra comfort and control. CPI button: allows user to change CPI 1000/1500/2000. Powerful and reliable connection with 2.4 GHz avoids lag or signal drop. Low battery reminder and ultra-efficient sleep mode. 12 months battery life (**Based on average usage of 1.5 hours per day)