Features: A classic analog flanger guitar effect pedal, features gentle and flat variation rumbling noise effect. 3 function knobs(Color, Ranger, Rate) and 2 models(Filter, Normal) enable you to make your own music tone. True bypass provides transparent tone. LED indicator shows the working state. Whole Aluminium alloy shell, durable and strong. Specifications: Brand: Rowin Material: Aluminum Alloy Input Impedance: 1 M ohms Output Impedance: 520 ohms Working Current: 13mA Power Supply: 9V DC Adapter(Not included) Item Size: 9.5 * 4.4 * 4.8cm/ 3.7 * 1.7 * 1.9in Note: The power adapter is not included. Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese)