... and water proof and grade IP65n Designed with narrow frame for easy portablen Three-point write with peace,precise ... ,no special touching pen is required,only your fingern Compatible with many operating systems,intelligent switching n Among winXP, ... ”InterfaceFull Duplex USB2.0(full speed)plug and play compatible,serial RS232,Baud rate:9600,8 Data Bits,1 ... -4-2,1955Level 4 21.5" IR touch frame