The ALTRONIX-SMP7PMCTX is a supervised power supply/charger that converts a 28VAC input to a regulated 12VDC or 24VDC output.Designed for access control, security, and CCTV systems, this power supply comes with a gel and sealed lead acid battery charger built in. AC input and DC output LEDs indicate power status. Housed in a wall mount enclosure, the unit features AC fail supervision and is protected against short circuits and thermal overloads. Also known as -SMP7PMCTX Proprietary Power Supply-Altronix SMP7PMCTX Proprietary Power Supply - 110 V AC Input Voltage