Check the listing for details. LHY Audio USB/DC 5V 12V Battery Powered Ultra Low Noise Linear Power Supply. Color: Black, Condition: New. Listed at 179.99 USD. Ultra-Low Noise Battery Power: Powered by a lithium battery instead of AC mains or USB bus power, it completely bypasses AC rectification and computer power noise. By isolating your system from household interference and USB ground noise, it delivers ultra-low noise down to 1µV, creating a quieter background, improved stability, and cleaner sound. LT3042 Precision Regulation: Built around the premium LT3042 linear regulator with PNP current expansion, this design maintains ultra-low noise while delivering up to 2A of stable output current. Compared to traditional regulators, noise is reduced by 2–3 orders of magnitude, ensuring precise voltage regulation that remains clean and consistent even under demanding loads. .