Firstly, I can’t attest to the compatibility with any implants.
These are LF RFID locks ( plus bluetooth, pin, and fingerprint ) and looking at the keyring fob, I would assume they would at least work with a FlexEM.
I know this is an old conversation, but it is still TBC on the spreadsheet. I am thinking about buying the L-H300 to see if it is compatible with my wife’s xEM and my NExT. I am hoping to find something compatible with both mine and hers. Unless you say otherwise I will go ahead and purchase it and let you know.