Specifications: 1) Extreme Low E.S.R.: less than 0.002 ohm 2) Auto on/off four-digit display 3) LED indicator lights 4) Electronic polarity protection circuit 5) Over-voltage protection circuit 6) Normal working temperature: minus 40 degrees to 95 degrees 7) Mounting brackets and hardware included Features: 1) Super complement ability for audiophile system 2) Compact design for more systems 3) Wonderful & stable performance with Hi security 4) Multiple choices for cabling 5) Multi-color digit display available (red, blue & white) 6) Multi-color super bright neon light available (red, white & pink)