As reported by AOPA Online.

Similar to its popular skyBeacon, which mounts on an aircraft’s left wing tip, the tailBeacon is designed for ease of installation and the company expects the task to take less than one hour, including paperwork.
The FAA has mandated ADS-B Out equipage for flights after Jan. 1, 2020, in airspace where a transponder is required today. ADS-B uses GPS satellites instead of ground-based radar to determine aircraft position, and is a key technology behind the FAA’s Next Generation Air Transportation System.
An STC with approved aircraft model list (AML) are in progress.
“We haven’t finalized the AML. We want to make sure any aircraft included will perform appropriately. Specifically we want to ensure that there is a clear sky view above the unit, and that it isn’t obstructed by a horizontal stabilizer,” said Ryan Braun, uAvionix chief operating officer. “That being said, the unit will still be available for installation by the [FAA] policy memo, which people have found to be effective and no more work than the STC.”