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 compatible with ELC Pro HD or ELB400.