The 9V iPower Ultra-Low Noise AC/DC Power Supply from iFi Audio utilizes noise-canceling technology to deliver exceptionally quiet power to any DC-powered device. The iPower features active noise cancellation developed for military fighter jets, which results in a 1uV noise floor. The dynamic noise suppression circuit uses a 12-element array on the output (DC barrel) and a 6-element array on the input (at the 2-pin mains) to contain and neutralize any noise, resulting in "battery quiet" DC power performance. iPower ships with several DC-barrel tips of various sizes and a right-angled extension cable, as well as a polarity inverter adapter for "center negative" audio products. Additionally, the iPower includes a set of globally compatible interchangeable pins for use with USA, UK, EU, and AU electrical outlets.