... Sizes: 18.5", 19" 22'', 24'',27'',32'',40'',42'',46'',47'',50'',52'',55'',60'',65'', up to 120".3 ... ripple max.200mV rmsSize above 52”(52” not included): external AC-DC power adaptorInterfaceFull Duplex USB 2.0 (Full Speed) Plug ... touch panelAgency ApprovalsCE, FCC, RohsOperating System:Operation System : Windows 7 46" Multi Touch screen panel with USB