ERGONOMIC DESIGN FOR MAXIMUM COMFORT: Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. ULTRA PRECISE MOVEMENT: 1000 / 1600 / 2400 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. 2.4G WIRELESS STABLE CONNECTION -- Enjoy the convenience of a wireless mouse, don't let another cord get tang in. ply insert the USB receiver into your computer and you're on your way. This wireless vertical mouse tracks every movement with its super-fast 2.4 GHz wireless connection, and never worry about delays or dropouts! Thanks to the wireless range of 33 feet, you can enjoy a clutter-free workspace and work from anywhere! WHISPER QUIET CLICK: Hours of clicking sounds can be annoying to you or those around you. The advanced stability built into the wireless ergonomic mouse reduces the tip noise and improves responsiveness so you can make each click precise and inaudible. Working without excess noise improves concentration, learning, and productivity. Click in peace with the vertical mouse your ears and coworkers will thank you! PACKAGE CONTENTS: 1x Wireless Vertical Ergonomic Optical Mouse, 1x 2.4G USB receiver (in the bottom of the mouse), 1x User Manual, 12-month hassle-free warranty.