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what is the br1 in connection with boss BPS242RF?

what is the abbreviation br1 stand for
MARILYN, October 2014
It probably stands for Boss Therm Receiver 1

George Clooney, October 2014
I know nothing of boilers or the remote wireless devices that control them - but from what I can gather BR1 refers to the wireless receiver of the Boss Therm remote thermostat - the piece that goes on the wall - the piece that has no display window - the one with the Set and Reset buttons.

Alan Titmatch, October 2014