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The white connector has two leads that go to your 3D printer electronics heated bed output. Mind the polarization and refer to the manual of the 3D printer electronics before attaching the board. The heated bed output is not polarized and can be hooked up anyway you like. For output to the headed bed above 18A we recommend active cooling using a fan. The power supply can be connected to the DC in header. Again mind the polarization. The board has small LED indicating that the MOSFET is switched on and the heated bed should be heating and a LED indicating that there is power going to the board.