1. An external 12V DC power supply for the test card, which plugs into the appropriate motherboard PCI-E slot. 2. Press the contact switch on the test card; when the test lights illuminate, all indicators on the test card should light up. If the lights do not turn on, check for issues with the Southbridge pins or damaged isolation capacitors. 3. The PCI-E test card is primarily used for repairing computer motherboards that are not functioning (where the digital card shows FF or does not display), issues with stability, or when the motherboard video card fails to display. colour: Green Material: Metal, plastic Package Contents: 1 x Check card Only the package content listed above is included; others are not included. Note: Lighting and different displays may cause the item's color to differ slightly from the actual product. The allowed measurement error is +/- 1-3cm.