The Aviom PS-120 is a universal switching power supply (US Rated) for most Pro16 Series products. Used with the following: AN-16/i, AN-16/o, A-16II, A-16R, A-16D, A-16T, A-16; Input Voltage: 100-240 volts; Output: 24VDC, 0.5A; Polarity: Outer equal negative, Inner equal positive