Amazon Description Package Included: 1* Mofii Keyboard included 1* Mofii Mouse included 2* AAA battery included 1* AA battery included 1* USB wireless receiver included 1* User Manual included Retro Style Set - Cute round keys and candy colors design,offering you a visual enjoyment and retro feeling Composite Design - Fn composite key help to save time，84-key punk suspension keycap,scientific key layout,relieves finger fatigue for long-time use Simple to Use- 2.4 G keyboard,just plug the usb receiver into a USB port and start crunching numbers right away. No drivers required Adopt intelligent Power-saving chip and 3 power saving mode,the keyboard mouse set go for months without changing batteries; Batteries included System Compatibility - The optical mouse with modern ergonomic design,DPI adjustable((contact info removed)-1600). Systerm compatible:Windows XP/win 7/win 8/win 10. Opened box, never used