EH0218B Features 2.4GHz radio transceiver Backlight offer great convenience for operation in darken room Plug and play Silicone & hard plastic keyboard for a comfortable touch Equipped with speaker and microphone Equipped with scroll bar for page turning General Specs Brand & Model ipazzport KP-810-05V  Color Black Type Wireless keyboard Battery Type Built-in 400mA lithium battery Power 5v/300mA System Required Windows98/2000/2003/XP/Vista/Windows7/CE， Mac OS， Linux， Android PC OS Product Details (without package and accessories) Dimensions 126 x 82 x 10mm Weight 70g Package Details Weight: 187.25 g Size: 18.5*12.7*3.00 cm Package Includes * ipazzport KP-810-05V Voice Mini 2.4GHz Wireless Full Keyboard with Backlight， Speaker & Microphone