Shake hands with your mouse The Pro fit Ergo vertical wireless mouse with its natural handshake position improves wrist and forearm posture for better comfort and muscle support Features include a contoured natural (46 7 degree) slope that neutrally positions The wrist an extended lip to support the little finger six buttons (left right forward back scroll wheel and DPI adjustment) and a plug-and-play Nano receiver that delivers a wireless range up to 20 meters (65 61 Feet) Available in black or gray