Balmar Max Charge MC618 Multi-Stage Regulator w/o Harness - 12V [MC-618]Max Charge MC618 Multi Stage Regulator without Harness 12V Balmar's MC 618 Regulator communicates with the SG200 Battery Monitor to provide information to the SG200 Color Display and Smartphone App. Now you can see how the MC 618 Regulator is directing your onboard charging activity from either the SG200 2" Color Display and or the optional Bluetooth Smartphone App. Basic setup functions can be accomplished from the SG200 Color Display, Smartphone