The Boss TR2 Tremolo is designed to provide guitarists with classic tremolo effects in an easy-to-use compact pedal. Dedicated "Wave," "Rate," and "Depth" knobs provide a multitude of effect possibilities.
 
Features 
- Built-in Wave knob offers the ability to alter the LFO waveform from triangle to square, allowing a wider range of tremolo variations. 
- LFO waveform has asymmetric duty ratio, providing control over tremolo phasing. 
- Rate knob is a sweepable, high speed LFO control, allowing fuller control over tremolo speed.

Uses 9-volt battery or PSA-120 adapter (not included).