Class D 450W (20HZ-500Hz)+150W(400HZ-16KHz), electronic frequency division, 4 euro load, THD=5%, with transformer, AC/DC equivalent power, Red LED screen, Bluetooth 5.0, USB/TF, radio, recording, Microphone priority, Erasers, TWS,With fiber input, full DSP karaoke adjustment, anti-howling, audio input/output, charging protection, undervoltage power off protection, automatic fan.