The compact NAPSC-2 comes as standard with the NAC 282 preamplifier and it can also be used as an upgrade for the NAC 202 or to power the HeadLine headphone amplifier. It’s a small but important link in the chain in extracting the highest levels of musical performance from these hi-fi components. Power Outputs: 18V Other: Power-Line Mains Supply: 100V-120V, 220-240V; 50 or 60Hz