The Atomos USB Type-C to Serial LANC Calibration Cable is 13" long end-to-end and allows you to connect virtually any Atomos monitor or monitor/recorder to a computer for use with select calibration systems. When using the Atomos calibration software, which is provided as a free download for Windows and Mac on the Atomos website, this cable can be used with the X-Rite i1 Display Pro calibration hardware. But you can also use optional third-party calibration software, in which case the cable can be used with any calibration hardware compatible with that software, such as Datacolor Spyder systems in many cases. The cable features a USB Type-C computer interface and has a 2.5mm LANC connector on the other end. Almost every Atomos monitor has a matching 2.5mm LANC port.