This is an utility for the K3 electricel device. This K3 Utility version can be used to load K3 MCU versions 1.32 and above to your K3.This version is required to load K3 MCU versions 1.79 and above to your K3. Files are in universal binary in .zip file. Use this utility to check for the latest releases of new features for your K3. Requires either a RS-232 cable or KUSB Serial-USB Cable to download from your Mac to the K3.