Ergonomic Vertical Design.Unlike those traditional ones which strain wrist and arm over time, causing great pain. The vertical design provides better support for your forearm minimizing wrist pain that can come from twisting. Added Forward-Back buttons (Only Used for Windows)provide convenience when webpage browsing; the superior choice for internet surfers, gamers and people who work at length at the computer. Widely Compatible with Windows 2000/ME/XPx64/Vista/7/8/10/Mac OS Xover V10.4)/Linux.(The Forward-Back thumb buttons are not recognized on the Mac OS X). Kindly Note: The USB receiver is inserted in the battery compartment of the mouse; 1 AA battery required but not included.No lights on both sides of the mouse,just blue decorative strips.Please peel off the transparent protective film on the bottom of the mouse before use.This is a right-handed mouse. Warranty & Support: Follow the platform's return policy, we provide the full technical support after selling and a