The SBAC-T40 SxS Thunderbolt 3 memory card reader/writer is built for stable, high-speed 4K file transfers, desktop browsing and direct video editing on Mac and Windows. It connects to the host system through a single Thunderbolt 3 port using the included Thunderbolt 3 cable, which also carries bus power, so no separate power supply is required. The reader takes one SxS memory card at a time and is compatible with Sony's SxS card range; SxS PRO X cards see accelerated effective transfer speeds through it compared with SxS PRO+ cards.