For everyone's information...I bought a Della mini split (Indoor unit model number is 048-MS-12K2VR-21S-QC-IN) and then purchased one of these dongles to try with it knowing there was no guarantee of it working. It did not work. Developer was helpful in troubleshooting, but I only get scrolling messages in the gui log indicating the device is trying to issue a GET_STATUS request and timing out. Still giving this a good review as I want to support products like these...but for anyone else with a Della unit..beware.