The Matrox Express 34 Adaptor allows you to connect the desktop version of Matrox MXO2 products to Laptop machines. You can install the Matrox PCIe host ExpressCard/34 adapter when your MacBook Pro is on or off. Connect the Matrox PCIe cable to the host ExpressCard/34 adapter and then insert the host adapter in your MacBook Pro's ExpressCard/34 slot until the adapter clicks into place.