The JLink Programmer has a 20pin (2x10pin 2.54mm pitch) connector. Though this is the industry standard programmer pinout, your development board or product may use a different pinout. This module lets you connect ARM boards with different pinouts to a standard JLink Programmer. Multiple types of connectors and cables are included which let you connect a JLink to your custom board/ breadboard.All this pins are labelled on the bottom of the module for easy identification and prototyping. This module reduces your prototyping time, by offering a ready solution to program and debug multiple types of ARM Boards.