Features: High quality and 100% Brand New. Both ISA bus and PCI bus are suitable Determine defects by difference sounds coding with build-in speaker Recall previous post codes at the touch of a button 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 matrix hexadecimal read-out that display's Power On Self Test (POST) status codes Support the power source working indicator -- +5V, +12V, + 3.3V and 12V(When indicator LED is on to indicate its respective power is fine, otherwise to indicate its respective power is failure. ) Fully compatible with any kind motherboards which has the PCI and ISA bus slot Self checking remote display function Dual POST code display - User can readout the POST at PCB component and solder side. It is easy to view the POST code when user plugs the POST card in computer system