... interface: USB,RS232C, keyboard interface etc 3.High shade,LCD display Basic descriptionGHC 51 series,Password keyboard which is widely ... series, Haiwei series, WYSE series, Shunhua series, and DES, LCD, LED and voice modules are provided for users to choose ... keyboay and the interface is KeyboardGHC515YHave15 keyboay and with LCD moduleGHC515DHave15 keyboay and with DES or 3 DES module ...