The First Secret - Badge

There is a badge on the right chest
It contains one's own blood type
When 'Blue Friend' encounters danger and falls into a coma
When emergency blood transfusion is required
Convenient for rapid blood transfusion and rescue
The second secret - the pager

When the firefighter remains stationary for more than 30 seconds
The pager will sound an alarm
Comrades in arms will come to rescue immediately upon hearing the alarm sound

The third secret - DRD
Towing rescue equipment

When firefighters fainted during firefighting and rescue efforts
When evacuation is urgently needed
Comrades will use the straps behind them
Drag the injured 'Blue Friend' to a safe area