100% brand new and high quality LCD display shows error code, reason & solution on screen in English No need error code book. Much more inconvenience than LED hexadecimal character display. Compact design, convenient to carry PCI interface for easy access to your desktop PC. Ideal for IT enthusiasts and engineers to test and repair computer. Inserts into PCI slot and sets correct BIOS by BIOS button before booting. Displays error code, reason and solution quickly after booting, if there is a problem. Compatible with AMI, Award & Phoenix BIOS button for setting correct BIOS and PAGE button for viewing records. SYS, CLK, +3.3V,+5V, -12, +12 indicators available. Indicator LED will show the state of the power on board. as the follow table show: 12 V PCI slots 12V Power supply indicator LED -12V PCI slots -12V Power supply indicator LED 5V PCI slots 5V Power supply indicator LED 3.3V PCI slots 3.3V Power supply indicator LED SYS System Operation indicator light , flash in the normal condition. CLK When hour clock output, weak light in the normal condition PAGE Key jump to previous code for short time press; jump to the previous five code for a long time press BOIS key Switchoverpresent "BOIS" for short time press ; Save the current selection for a long time press 12 V PCI slots 12V Power supply indicator LED -12V PCI slots -12V Power supply indicator LED 5V PCI slots 5V Power supply indicator LED 3.3V PCI slots 3.3V Power supply indicator LED SYS System Operation indicator light , flash in the normal condition. CLK When hour clock output, weak light in the normal condition PAGE Key jump to previous code for short time press; jump to the previous five code for a long time press BOIS key Switchover present "BOIS" for short time press ; Save the current selection for a long time press