Buyers should prioritize Input/Output Resolution and Frame Rate, specifically looking for 4K@60Hz pass-through and at least 1080p@60Hz capture capabilities. Ensure the device supports USB 3.0 or USB-C 3.1 Gen 1 interfaces to provide the necessary bandwidth (5Gbps) for uncompressed video data transfer, which minimizes latency. Additionally, verify support for UVC (USB Video Class) and UAC (USB Audio Class) protocols, as these allow for driver-free plug-and-play functionality across Windows, macOS, and Linux systems.