As stated on the Data Sheet, this product is available only in selected markets. I don't believe it's open for US distribution; internal documentation states: "Ships to Bulgaria, Croatia, Romania, Russia, Slovak Republic, and Ukraine only".
Sx550X, Sx350X, Sx250: PSE will Supply Power to Catalyst PSE Ports
May 31, 2016
June 5, 2017
Configure Remote Network Monitoring (RMON) Events Control Settings on a Switch through the Command Line Interface (CLI)
Remote Network Monitoring (RMON) was developed by the Internet Engineering Task Force (IETF) to support...