Mono design, internal power board array filter, low noise. This amplifier with perfect speaker protection circuit. It can protect your expensive speaker from the impact sound when power on /off. All parts are brand new and original, and the high-power Transistors are brand new original ONSEMI MJ15024. LM301A is imported from NS. All resistors use genuine metal film resistors with copper feet, 1% accuracy, including high-power resistors. The inductance is manually measured by a precision digital bridge, accurate to 0.01UH 0.1%. Use customized 100W OFC pure copper toroidal transformer with iron core imported from Japan. Sandblasted pure copper RCA+ gold-plated crystal terminal. Works voltage: AC 115V or 230V. Front panel color: Black/Silver. Output Power: 75W at 8ohm load. Package weight: About 4kg. Mono Class AB QUAD-405 Power amplifier X1. NOTE: We do not provide any cables.