HiFi sound quality incorporating "Dynamic Loudness" system for perfect bass and treble compensation at low volumes of music. 20 W RMS 40 W musical program, of maximum audio output power, for connection from 1 to 8 speakers or box loudspeakers of low impedance Key switch to turn On/Off status. Extra PIN output for activation and amplification of supplementary sound through EGi power stages. Led indicators for Music signal bluetooth, AUX and On/Off status. Built-in external power supply 115/230 Vac to 15 Vdc via female Jack coaxial connector.