1. PCI double-sided display diagnostic card 2. This PC motherboard diagnostic card, also known as "POST card" (power on self-test), 3. Used to test and diagnose motherboard problems. 4. It is a powerful diagnostic tool that technicians and administrators can troubleshoot compatible laptops by using the 25-pin parallel printer port (LPT) and USB port (for power) or using a standard PCI slot for desktop computers various problems. 5. Easy to carry and store<br><br>Installation guide: Insert the diagnostic card into the PCI or LPT slot of the computer motherboard. Turn on the power, and according to the digital code displayed on the diagnostic card and the code meaning table in the delivered "Instruction Manual", you can know which part of the hardware has the problem. Technical Parameters: Bus interface: 32-bit standard PCI Digital display: 7-bit digital display, showing fault code, two points showing 5V and reset signal; Indicator light: 1. -12LED: -12V power supply indication, 2. +12LED: +12V power supply indication, 3. CLKLED: CLK signal indication, 4. OSCLED: OSC signal indication, 5. IRDY BIOS LED: read BIOS instructions, 6. 3.3V/-5V LED: 3.3V/-5V backup power supply indication, Applicable: All computers with PCI interface. Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB<br><br>Package Contents: 1 x Diagnostic Test Card 1 x USB Power Supply Cable 1 x Speaker Cable 1 x English Manual<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.