35W Multi-Function Mini Mixer Amplifier with USB.SD is a 4Ω/100V mixer amplifierwith multiple audio source input. It supports MP3, SD card and USB mode with recording and Bluetooth functions. It also has reverberation and MIC prior functions. It can eliminate original singing and intelligently detect transmission line load impedance in real time. When line is overloaded or in light load, output will be closed automatically and will recover when load turns normal.