This motherboard diagnostic card， also known as a "POST card" (power on self test)， is a powerful diagnostic tool for technicians and administrators to troubleshoot various problems of compatible notebooks by using the 25 pin parallel printer port (LPT) and USB port (for power).Features: Check the hardware in minutes Pinpoint problems you don't even know you haveEasy installation with no need to open the computer case to useDoes no harm to the device while insert into the wrong slot of the main board Designed to work on desktop as well as notebook computers through the USB port (for power) and the 25 pin parallel printer port (LPT)Must use the parallel port and the USB port at the same time to operate this analyzerSpecification: Interface Type: 25 pin male printer connecter2 LED indicator: KEY， +5VHexadecimal character display2 keys for codes PREV /NEXTCompiant BIOS: PHOENIX BIOS4.01~6.01， AMIBIOS 6.24， AWARD BIOS 4.51Concrete Computer Type: IBM， T20， T21， T22， T23， A20， A21， A22， DELL640， TOSHIBA 4030， etc.Package Includes:1 x PC analyzer card1 x 30cm male to male USB cable1 x English manual