The Shure ADPSM-4CL is a perpetual license for the Axient Digital PSM system that adds four stereo audio channels. This license is managed through ShureCloud, providing a cost-effective scalable solution for scaling an in-ear monitoring systems for live sound, broadcast, and installed applications. 

Axient Digital PSM channel licenses are subject to the Channel License Agreement available at https://www.shure.com/en-US/legal. A ShureCloud account is required to activate and manage channel licenses. For more information, see the ShureCloud User Guide and Cloud Terms of Use available at https://www.shure.com/en-US/legal.