VDO Cyclecomputing m5 Manual De Instrucciones Breve página 55

Pairing the transmitters
ATTENTION:
when using the transmitter for the first time, the bike
recognition switch must be set to either BIKE 1 or BIKE 2.
Only then will the automatic bike recognition work.
PRESS and HOLD the button until the LED flashes.
Green LED flashes once = bike 1 is selected
Red LED flashes twice = bike 2 is selected
55