The Siemens part number 6AV6381-2CB07-3AX3 refers to the SIMATIC WinCC RC Client Upgrade from V7.X to V7.3. It’s designed for WinCC RC clients (excluding RC128) and includes both runtime and configuration software. 

Type: Software upgrade (from V7.X to V7.3)

License: Single license with USB key

Media: DVD + USB flash drive

Languages: Typically includes major European languages

Weight: Approx. 0.212 kg

Packaging Dimensions: 19.20 x 27.80 x 3.00 cm

Lifecycle Status: Phased out since October 1, 2019