Features: 1.2.4GHZ Wireless Connection: The wireless keyboard and mouse combination uses an enhanced 2.4G chipset to achieve a no dropped connection. A tiny nanometer receiver, unified use of keyboard and mouse; saving your USB port. 2.Multi Level DPI Mouse: The wireless ultra thin mouse has 5 levels of DPI adjustable (800/1200/1600), so we can choose the right cursor speed according to activities such as work, games, or TVs or monitors with different resolutions. 3.Rechargeable Battery: Both the wireless keyboard and mouse have built in lithium ion batteries, which can work for more than 120 hours when fully charged. The keyboard and mouse will automatically enter the smart sleep mode within 20 seconds of inactivity, ensuring high energy efficiency and long battery life. 4.Mute Mouse: Scissor keystrokes make typing comfortable, light and responsive, and the raised angle supports your hands to work for a long time. The silent mouse has a soft click, no longer disturbing your surroundings! 5.Fashionable and Compact: The keycap adopts a thin and flat style, which is elegant and saves desktop space. The thin keyboard and mouse top adopts a metal finish, and the streamline shape makes it fashionable in your workplace. specification:Item Type: Keyboard Mouse Combo Material: ABS Product Wireless Distance: Approx. 10meters / 10.9yd Working Voltage: 3V Frequency: 2.4G Battery Capacity: Mouse 500mah Lithium Battery (Ship with Inbuilt Battery) Keyboard 250mah Lithium Battery (Ship with Inbuilt Battery) Engine: Optical Button Life: 5 Million Times Applicable System: For Windows 95, for WIN98, for NT, for ME, for WIN2000, for XP, for vista PackageList: 1 x Wireless Mouse(Ship with Inbuilt Battery) 1 x Wireless Keyboard(Ship with Inbuilt Battery) 1 x USB Receiver 1 x Charging Cable