Movall MP-317 Phoenix Wings Tremolo 

Introduction:
Movall Tremolo guitar effect pedal is applied a photoelectric circuit which sounds just like one of the tremolos you would find in vintage tube amps. It is flexible yet easy to use. A simple three knob control allows for adjustment of rate (speed), depth (how much the tremolo fluctuates) and wave. The wave knob is very cool, because you can change it from a subtle triangle wave to a drastic square wave. This way you can achieve the classic tremolo sounds we all know and love as well as the more modern "stutter" sounds. It's also possible to create amazing rhythmic pads, especially if combined with a cool delay sound.

True bypass design:
True bypass switch lets your instrument's signal pass through a non-electronic bypass line when the effect is disengaged, feeding your amp with direct, unaltered signal from your instrument.

Specifications:
Small, lightweight and exquisite. 
Aluminum-alloy classic, stable and strong.
True bypass for zero tone coloration.
Slip resistance bottom.
Input: 1/4” monaural jack.
Output: 1/4” monaural jack.
Power Supply: 9V DC (Negative in the center).
Current Draw: 50 mA.