Electronics of pixhawk

Hi all …Its my first time to go to build qoudplane im not want to use outonomous fligh and mission planner just i want to use pixhawk 2.4.8 so when i want to select pixhawk there is another electronics in the box like gbs buzzer savety switch i2c and etc so what is necessary for me and what is not necessary to use?

This forum is for PX4. For ArduPilot (used with MissionPlanner), go to discuss.ardupilot.org.