Digital multi-effects unit equipped with a variety of effects. Can be used like the MS-50G+ MultiStomp!! It seems to be a BEHRINGER, as the LED lights up when off and turns off when on. Sound output operation confirmed OK! - Model: FX100 - Type: Digital Multi-Effects Unit - Input/Output Terminals: IN A, IN B, OUT A, OUT B - Functions: Pitch delay, phaser, modulator, etc. - Power: DC 9V Thank you for viewing.