I've never seen anything like that device either. It may be exclusive to New Zealand and Australia, and not available here in the US. Let us know if you do find out what it is.
Every day's a learning experience, though sometimes not what we expected.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
1 Spoiled Dog