Mechanical Endstop kit is for RepRap 3D Printers or CNC machines, it is supported by RepRap electronics, RAMPS 1.4 and by other popular RepRap boards. Customized high quality connection, using 22AWG wire, copper wire inside is very thick, can be resistant to current 2A, 300V voltage. An insulating layer over a wide range of temperatures, up to 80 degrees. Not easy to break, convenient for plug, ease for use, one side is an integrated plug. Red line connecting VCC (ramps of +), Connect the black wire GND (ramps of -), Green Line connection SIGNAL (ramps in s). Connection Description: Red line connecting VCC (ramps of +) Connect the black wire GND (ramps of -) Green Line connection SIGNAL (ramps in s)