Control device with adjustable communication period and method for adjusting communication period

A control device with adjustable communication period for an electromechanical gear shifter of a bicycle, comprising:

• a master controller comprising a working mode and an idle mode, wherein the master controller sends a broadcast signal with a first period when the master controller is in the working mode, and the master controller sends the broadcast signal with a period selected from an idle period set and greater than the first period when the master controller is in the idle mode, wherein the idle period set comprises a second period at least and the second period is greater than the first period;
• and
• a trigger sensor electronically connecting to the master controller, wherein the trigger sensor detects a trigger state and sends a trigger signal;
• wherein the master controller switches to the working mode when the master controller receives the trigger signal, and the master controller selectively switches to the idle mode when the master controller does not receive the trigger signal.