Viwind Wireless Ergonomic Mouse 2.4G Vertical Optical Mouse with Nano Receiver,4 Adjustable DPI 800/1200/ 1600/2400,Rechargeable Li-Battery,6 Buttons for Computer,Notebook, PC, Laptop,MacBook(Blue)

Ergonomic Design
Tired of using the traditional grip? Take a break from overly-clunky or uncomfortably tiny mice. The ergonomically-designed thumb rests and grips fit the contour of your palm for maximum comfort.
Easy-access use
Six buttons give you improved control over your computer's systems. Whether dragging and dropping, selecting large volumes of data, or casually gaming, this mouse provides a low-cost, effective solution for multiple computing needs.
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30 Day Money-back Guarantee and 3-year limited hardware warranty
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Note:
The side buttons are not available for Mac OS because the system itself is a closed one, not open to the public, but the other function can be used normally.

Specifications: Material: ABS
Key number: 6 Buttons
Resolution:800-1200-1600-2400DPI( One key switch)
Wireless technology: 2.4GHz
Operational range: 10m~15m/33ft~50ft
Battery capacity: 650mAh rechargeable Li-Battery (built-in)
Charging time: 2-3hours
  Operation voltage: 3.7v
  Operation current: <5mA
Weight: 3.3oz/93g
Dimensions: 4.05x 2.76x 2.75in/103x 70x57mm
  Suitable for:Right handed,Programmer,Office staff,Student,internet surfers, gamers and people who work at length at the computer
Compatibility: Windows 8 / 7 / 10/ Vista / XP / 2000, Linux, Android; Mac OS X
(NOTE: 1.The two thumb buttons are not recognized on the Mac OS X; 2.This wireless mouse is not compatible with Mac OS X El Capitan). 

Package includes:
1x ifun Wireless Vertical Ergonomic Optical Mouse
1x 2.4G USB Nano receiver
1x Charging Cable