Harness Kit includes:

9V Battery Case * 1 (Seeeduino compatible, does not fit an Arduino or Freeduino board)
2.1mm DC jack to pin plug adapter * 1 for Seeeduino (Arduino already has a DC jack on board)
Arduino/Seeeduino Chasis * 1
Screw/nut/pad * 3
Plastic Rivet * 3
Rubber Pad * 4