Most power supplies only supply power. The DRPSM1 power module is a complete power management system. It provides clean, efficient power to optimize performance of your Black Max modules and a low-voltage disconnect to protect and extend the life of batteries used in the optional battery backup system. In the event of AC power loss, the automatic battery switchover occurs with no spikes and without missing a beat. The DRPSM1 senses battery conditions using a three-mode, temperature-compensated charger. Batteries are recharged precisely in accordance with the manufacturer’s recommendations.