The PufferFish Practice Board allows students to learn and practice the essentials of through-hole soldering on a printed circuit board. Before soldering your PufferFish Control Box, we recommend using the board to practice soldering skills. When completed, the kits feature a functioning DPDT switch which will light the LEDs when power is applied, as well as lighting an LED different colors depending on the direction the switch is thrown. The PufferFish Practice board simulates one switch of a Pufferfish ROV controller. A 9V battery, not included, is needed to power this kit.