CK0211B Features Bluetooth wireless keyboard with wireless voice function Wireless audio transmission Supports voice chat via the QQ， Skype High sensitivity touchpad Dual-mode learning infrared remote control， three-in-one design Bluetooth wireless connection， smart & portable design USB transceiver， plug-and-play With LED backlight With the code function to eliminate radio interference With touchpad 90-degree vertical flip switch (Fn + Esc key) With Windows multimedia control keys (Google TV hotkey) Fully supports multiple national language， multi-touch Allows you to view home computer entertainment in long-distance and shares the big TV screens and projectors With scroll bars and supports scrolling page Arbitrary pairing General Specs Type 2.4G Bluetooth wireless keyboard with wireless voice function Keyboard Layout QWERTY keyboard layout Key Number 82 key full keyboard Transmit Power Max +4 dBm Working Voltage 3.7 V Operating Current <50mA Charging Voltage 4.2- 5.05 V Charging Current <350m Sleep Current  <1mA Operating Range 10 m radius Battery Configuration 800mA Built-in rechargeable lithium battery  Standby Time 600 h Supported OS Windows (all)， Linux (Debian-3.1， Redhat-9.0， Ubuntu-8.10， Fedora-7.0tested)， DOS， BOIS Android pc OS， Mac OS， IOS Application Refined decoration accessories for home entertainment and real estate home， education and training， conference speech， onboard computer， used with projector instrument and network TV (Google TV Box)， PC network leisure， KTV song system Package Details Weight: 208.65 g Size: 21.8*12.5*3 cm Package Includes * Bluetooth Wireless Keyboard