ST-BD01Q Seco-Larm Low-Voltage Battery Cutoff 12/24VDC Selectable The ENFORCER Low-Voltage Battery Cutoff prevents deep discharge of backup batteries. The ST-BD01Q ties directly into most 12 or 24 VDC power supplies or alarm panels for easy plug-and-play installation. A Master On/Off switch easily connects or disconnects the battery and AC power supply from the control panel.