[Ergonomic Vertical Design]: Unique vertical ergonomic computer mouse with special volute bionic design reduces arm discomfort and hand stiffness.This series is designed for large hands. [2.4G Wireless]: 2.4G RF wireless connection with USB Nano Receiver, with 10m/30ft efficient distance, just plug and play (please note that due to simple design, the USB Nano receiver stored in the battery compartment, please find the USB receiver in the battery compartment ) [Removable Wrist Rest]: Humanized wrist rest design, let your forearm and vertical mouse be a whole part and make your wrist lift from the ground and rest on the comfortable pad which protects your wrist from friction when moving the mouse [3 Adjustable DPI]: 800-1000(default)-1600, 3 Gear DPI which would be easily shifted according to your daily working requirement by the dotted switch in the bottom. And with sensitive optical engine, providing smooth and precise tracking on a wide range