Donner Tremolo Pedal, Golden Tremolo Guitar Pedal Analog Tremolo Effect Pedal for Electric Guitar and Bass True BypassGolden Tremolo: The Golden Tremolo is inspired by the iconic optical tremolo sound coming from legendary US style combo amps, giving you a deep, natural, pulsing tremolo sound Wide Control: Dedicated Speed, Bias and Depth knobs allow you to dial in your desired sound Durable Construction: Whole Aluminium alloy, classic, stable and strong; Mini Size, easy to go and pedal boards friendly True bypass: True bypass provide transparent tone.; LED indicator