Product Features 1.Left-Hand Ergonomic Vertical Mouse: Specifically-designed for left-hander, scientific ergonomic design accommodates your hand in a completely natural position, without twisting your wrist around like a standard mouse, relieves pressure in wrist joint and reduce risk of cramping. 2.Adjustable DPI Resolution: 800 / 1200 / 1600 DPI Optical Tracking Technology ensures greater sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces, auto Power-Saving to save energy 3.Greater Functionality: The Vertical Mouse have added back / forward buttons on the left side of the mouse provide great convenience for web browsing. (Note:next/previous buttons can't be used on Apple computer). 4.Easy Operation: Plug and play, no need any driver, enjoy the vertical mouse directly after inserted the USB plug 5.Wide Compatibility: Compatible with Windows7/8/10/XP, Vista7/8 and Mac OS Linux etc( Page up/down Button are invalid for Mac OS). Fits for desktop, laptop, PC, Mac book and other devices.(We will offer Worry-Free warranty and friendly customer service)