Designed specifically to work with 16V & 28V setups. This cable can be ordered to power one or 2 devices. When you require only the best, then it's SonarPros. This harness is a separate pull from the graph harness and you can run to your 16V or 28V supply. Dual power hookup cable option can handle both the head unit and the forward scan module at 16V. If you already have dedicated wiring for graphs and you just need the 28v to the module, or you have two forward scan devices on boat we have you covered.