Dual output, field selectable 12 or 24VDC via clearly marked toggle switch. It supplies 1 full AMP continuous current output, even while charging back-up batteries. SPDT AC monitoring output allows for remote monitoring of the power supply's 110VAC input. Separate voltage inputs for load and battery allow the batteries to charge at a higher output while the load remains at exactly 12 or 24VDC. It has LED indication (AC and DC) showing power supply status. UL Listed low current fire alarm disconnect requires only a minimum size fire alarm relay and wire gauge. Polyswitch 2A breaker allows for large short duration inrush current if batteries are installed (approximately 20A for 1 second). It has line voltage and DC fuses. It has sealed lead acid-gel battery charging capability (battery not included). UL Class 2, linear regulated power supply provides the cleanest power available sensitive, active safety and security devices. UL Listed.