The JF-09 Tremolo guitar pedal from Joyo achieves the vintage tremolo or surf warble sound with ease. The controls are easy to understand and the features are similar to your favorite guitar amp's layout -- with a similar circuit design, too. On the left, a Rate knob controls how quickly the volume swells fluctuate, while the right Depth knob controls overall dynamics. Tremolo from Joyo also has as important extra for your live playing or recording needs: Fortunate for your rhythm sound, the LED on/off indicator pulses with the signal modulation rate. True bypass and solid ¼ inch connectors make this pedal professional and reliable when it comes to signal integrity, tone and long-term usage. The sound is understated when the depth is low, and somewhere between magical and psychedelic when its all the way up; the JF-09 Tremolo is really all you could expect from a tremolo guitar or bass effect. Rhythm accuracy is increased by the LED function, allowing this pedal to perform in a variety of situations, coupled with a delay, behind a chorus, or whatever else you can come up with! The Tremolo sound can really add dimension and variety to your sound!Features: Photoelectric tube circuit, same as the tremolo of the old electronic tube amplifier. Intensity and Rate knobs make it easy to adjust the tone and vibe. True bypass design minimizes tone loss. Achieves the distinctive sound heard on so many classic recordings. Specifications: Model: JF-09 Color: Yellow Material: Aluminum alloy Input impedance: 1Mω Output impedance: 1Kω Running current: 7mA Speed range: 1Hz-20Hz Power: 6F22 9V battery / DC 9V adapter (Neither included) Item size: 12 * 7.1 * 5.5cm / 4.7 * 2.8 * 2.2in Item weight: 290g / 10.2oz Package size: 13 * 7.9 * 6.2cm / 5.1 * 3.1 * 2.4in Package weight: 325g / 11.5oz Note: Power supply not included. Please use the 9V power adapter whose polarity is negative center otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese)1 * Year warranty through our store No Duty to Canada and USA FAST 'N FREE USA Shipping (typically about 4 days) Ships from Canada