Shake hands with your mouse. The Pro Fit Ergo Vertical Wireless Mouse, with its natural handshake position, improves wrist posture for better comfort. In an independent study conducted by professional ergonomists, "users rated the vertical mouse as the most comfortable and that it conformed to their hand naturally.". Features Right-Handed; 6 buttons; USB wireless receiver; Battery indicator, On/off power switch, Scrolling wheel, Vertical; Specifications Color: Black; Buttons Qty: 6; Connectivity Technology: Wireless; Ergonomic Design: Yes; Max Operating Distance: 66 ft; Movement Resolution: 1600 dpi; Orientation: Right-handed; Performance: Realtime sensitivity switching 800/1000/1200/1600 dpi; Product Type: Mouse; Wireless Receiver: USB wireless receiver; Wireless Receiver Size: Nano; Compliant Standards: Plug and Play; Battery Type: AA type; Connector Type: 4 pin USB Type A