The Siemens 6AV2105-4KK05-0AK0 is part of the SIMATIC WinCC RT Professional series. It is an upgrade package that transitions WinCC V7.0 to V7.4 RT/RC 8192 PowerTags to WinCC Runtime Professional 8192 PowerTags V15.1 in TIA Portal. This is a runtime software with a single license, and it comes with a software and license key download instead of a physical USB flash drive This product has been discontinued.