The elinchrom skyport speed usb transceiver is designed to connect to the usb port on a mac or pc with the help of the free software available for download on the elinchrom website up to 64 individual heads or packs can be controlled from one computer with a variety of sychronisation and set up options available full control is only available by using a full rx transceiver system flash heads connected to a universal receiver will only offer synchronisation and strobing options nb not compat