And AFAIK, at this point, the SE2 is still the only portable EC device of its kind approved by CASA.
https://www.uavionix.com.au/news/skyecho2-portable-adsb-inout-now-approved-in-australia/
The SkyEcho2 portable ADS-B transceiver has been accepted by the Civil Aviation Safety Authority (CASA) as an approved Electronic Conspicuity (EC) Device as an enhancement to “See and Be Seen” from 16th July, 2020.
SkyEcho2 is the world’s first commercially available portable ADS-B IN and OUT system. Complete with an integrated TSO certified SBAS GPS and barometric altimeter, SkyEcho2 transmits your aircraft location, altitude, and identification via 1090MHz ADS-B, enabling you to be seen by nearby aircraft equipped with an ADS-B receiver. In Australia, the integrated ADS-B IN receiver connects wirelessly to your favourite Electronic Flight Bag (EFB) application adhering to an industry-standard protocol for ADS-B traffic – including OzRunways and AvPlan EFB.