The T-Rex Engineering Tremster Tremolo Effect Pedal delivers rich, vintage-style tremolo with a warm and organic tone, perfect for adding dynamic depth to your guitar sound. This used unit is in excellent condition, offering the same lush modulation and superior build quality that T-Rex is known for. Featuring Speed, Depth, and Volume controls, along with a dedicated Attack knob for shaping waveforms between smooth sine and choppier square wave styles, the Tremster gives you full control over your tone. It operates with true bypass switching to preserve your signal integrity when not in use and runs on a standard 9V DC power supply. Whether you're aiming for subtle pulses or dramatic rhythmic modulation, the Tremster is a versatile and inspiring addition to any pedalboard.