The Siemens part number 6AV6381-2CB07-3AV3 refers to the SIMATIC WinCC RC Client Upgrade Asia, specifically designed to upgrade from V7.X to V7.3 for WinCC RC clients (excluding RC128). 

Type: Runtime/configuration software upgrade

Media: DVD + USB flash drive (single license)

Languages: Asian language support (typically includes English, Simplified/Traditional Chinese, Korean, Japanese)

Compatibility: For existing WinCC RC clients running older versions (V7.X)

Weight: Approx. 0.216 kg

Packaging Dimensions: 18.70 x 27.20 x 3.30 cm

Lifecycle Status: Phased out since October 1, 2019