Built-in Rechargeable Li-Battery with Auto-sleep Function:The iFun Wireless Mouse has 650mA battery capacity,only about 3 hourFull charging time needed and support 720 hours working Enters Wer saving mode automatically after 8 minutes idle,press any button can wake it up,conserves Wer and extends product life If the mice lack of Wer,connect the charging cable,then it can work simultaneouslyScientific Ergonomic Design with Next/Previous Buttons:Contoured shape,Weat-resistant ,skin-friendly finish,added next/previous buttons to browsWeb page faster,sturdy scroll wheel with rubber oil coating that prevents fingers from sliding,the ergonomic computer mouse allow for natural hand positioning and ultimate comfort It eases tension on the wrist and hand for right-handed users Encourages healthy natural "handshake" wrist and arm positions for smoother movement and less overall strain3 Adjustable DPI Levels:800,1200,1600, easily change the cursor sensitivity depending on your activity Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces Best for things that require precision like color correcting and photo edits or make it faster for browsingPlug-and-play and Wide Compatibility:Comes with a USB Nano receiver, plug and play directly 2 4GHz wireless technology ensure longer working distance-up to 33ft in 360 degree with no interferencWelCompatible with Mac OS X, Linux and all versions of Windows such as Windows7/8/10/XP etc Fits for desktop, laptop, PC, Macbook and other devicesWarrantWe support 30 Day Money-back Guarantee and 3-year limited hardware warranty,feel free to contact with us,our service are alwayReady to support 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 Why Choose Us? All Our Products are Produced under Strict Quality Inspection 30 Day Money-back Guarantee and 3-year limited hardware warranty Professional After-Sales to Make Things Right within 24hrs 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 SpeciCATions: 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: Dimensions: 4 05x 2 76x 2 75in/103x 70x57mm 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 noCompatible with Mac OS X El Capitan) ?Package includes: 1x ifun Wireless Vertical Ergonomic Optical Mouse 1x 2 4G USB Nano receiver 1x Charging Cable