Professional Digital Echo with separate repeat and delay controls. 3 Mic Inputs with individual volume controls and echo on/off switches. Music Master bass/mid/treble controls. Mic with Individual bass/mid/treble controls. 3 Sets of A/V/S-Video/Input/Output Jacks. Instruction to connecting smart devices to the amplifier through Bluetooth. Please note, Bluetooth will only send audio to the amp, graphic won’t get transferred. Note for overseas customers: This is an electronic product designed for use in the USA.