Securitron's Model BPS-12-1 is a 12 volt, 1 amp power supply delivered in a single lockable enclosure with the line voltage connection to be made by screw terminals. Model BPS-24-1 is the same unit with 24 volt, 1 amp output. All units feature regulated, adjustable power with integral sealed lead acid/gel cell battery charging capability. All units also meet Class 2 electrical requirements, which means under the National Electrical Code that output wiring need not be in conduit. Always check with your local building department to make sure you are complying with applicable wiring codes before installing these units. Note that a special version of the BPS series operates on 220 VAC input. This carries the part number prefix: BPSH.