Features 1、4 functional control knobs for adjusting the Mix, Feedback, and Delay. 2、Aluminum alloy metal shell, durable and sturdy, lightweight and compact. 3、Mini compact size, portable and easy to operate. Specification Features: 4 functional control knobs for adjusting the Mix, Feedback, and Delay. Aluminum alloy metal shell, durable and sturdy, lightweight and compact. Mini compact size, portable and easy to operate. Equipped with a non slip silicone pad, easy to install, making the effect pedal non shifting and anti slip during performance. Specifications: Material: Aluminum alloy Input Impedance: 1MΩ Output Impedance: 470Ω Running Current: 9mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 252g / 8.90oz Package Weight: 297g / 10.48oz Package Size: 12.5 * 8 * 5.7cm / 4.92 * 3.15 * 2.24in Package List: 1 * Effect Pedal 1 * Silicone Pad 1 * Manual (English) Note: Please use a DC +9V power supply which is positive outside and negative to connect this unit and connect the input and output socket to this unit. Package List 1 * Effect Pedal 1 * Silicone Pad 1 * Manual (English) Note: Please use a DC +9V power supply which is positive outside and negative to connect this unit and connect the input and output socket to this unit.