Hi and Low voltage 3 regulators. 8 power input voltage: ~110 or 220V50Hz±10%. 9 It has a very high input impedance, of about half a meg [500k ohms], and quite a low output impedance, less than 200 ohms.This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "hkaudio1" and is located in this country: HK. This item can be shipped worldwide.