Shimano Steps OPUS ELECTRIC Guide De Démarrage Rapide page 4

POWERING THE MOTOR ON /OFF
ON
Power on the system by holding down the cycle computer's
"POWER" button for 2 seconds and press the battery's "POWER"
button once. The indicator lights will turn on.
OFF
Turn off the system by holding down the cycle computer's
"POWER" button for 2 seconds. Press the battery's "POWER"
button once to shut it off.
2 SECONDS
DO NOT STEP ON THE PEDAL
WHEN TURNING THE SYSTEM
ON /OFF.