Both ISA bus and PCI bus are suitable. Determine defects by difference sounds coding with -in speaker It can diagnosis the motherboard signal which show the problem of CPU, Memory, video card, etc The POST code display is made up of a dual, dot hexadecimal read-out that display's Power On Test (POST) status codes Support the power source working indicator -- +5V, +12V, +3.3V and 12V (When indicator LED is on to indicate respective power is fine, otherwise to indicate respective power is failure.) Fully compatible with any kind motherboards which has the PCI and ISA bus slot. checking remote display function Dual POST code display - can readout the POST at PCB component and solder side. It is easy to the POST code when plugs the POST card in computer system. Recall previous post codes at the touch of a button. Material: plastic colour: green Package Contents: 1 x PCI Analyzer Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.