Cutting-Edge Ergonomic Design: The Humanscale Proclick Ergonomic Computer Mouse is engineered by industry-leading ergonomists to contour to your palm, with a comfortable lift to eliminate contact between your right hand and work surface 8 Programmable Buttons: This 8 button wireless mouse allows you to maximize efficiency and work smarter, not harder Multi-Device Compatibility: This professional mouse boasts a multi-device capability that supports Bluetooth connectivity; USB port required for set up with PC or Mac Industry-Leading Precision: Engineered to last, the ProClick Ergonomic Bluetooth Mouse features Razer 5G Advanced Optical Sensor for cutting-edge precision and is durable for 50 million clicks Up to 400 Hours of Battery Life: Rechargeable with up to 400 hours of extendable battery life when fully charged to power through long hours of work at the office, at home, or anywhere