The HP Thunderbolt 3 Flex IO v3 module (HP part 440A5AA) is an internal add-in card that adds a Thunderbolt 3 port, using a USB-C connector, to supported HP mini desktop PCs through their rear Flex IO expansion slot. Once installed, the port can connect high-speed Thunderbolt storage, docks, displays and other USB-C devices, which is useful when a compact business PC is deployed on a desk with a monitor and peripherals that rely on Thunderbolt or USB-C. HP lists compatibility with the HP Elite Mini 800 G9, Elite Mini 600 G9, Pro Mini 400 G9 and Pro Mini 260 G9 desktops; check the PC's model and generation before ordering, as Flex IO modules are specific to each platform. The module is small at 41.8 x 60 x 16.5 mm and 14.5 g, and ships with a quick installation guide. Installation involves removing the Flex IO blanking plate, fitting the module in the slot and securing it, and it is typically done by IT staff when configuring or upgrading a fleet of mini PCs.