DeWalt 382642-06 Electronic & Switch For DW307 DW303K DW307MK Reciprocating Saw

382642-06 is the Electronic & Switch Assembly used for several DeWALT reciprocating saws. 
Function:

382642-06  is the primary internal control unit for the saw. It manages power control, act as the main trigger switch to turn the tool on and off ,regulating the strokes per minute (SPM) based on how far the trigger is depressed.