What is it for? 
This feature on the machines will make them work automatically without the use of a pedal, trigger, or sensor. This feature is also useful when cleaning the system or when you want to set a pace for your employees.
 
Specs:
Switch Power Ignition ZB2-BE101C, 10A, 660V, 6kV
Material = Plastic/Others.
A = 35 mm
B = 70 mm
C = 28 mm
D = 21.5 mm
E = 30 mm
F = 40 mm