Product assembly: holster + + keyboard support, an organic whole.System support: the keyboard is compatible with Windows and android android free drive is suitable for most of the tablet, also can connect home desktop and laptop use, plug and play, no installation, can be directly in typing.Size reference: [hands, medial method, maximum error, the size of the tablet can) : 7 inches long 13 * 20.5 * 20.5 CM high