1. The shell is made of high-strength hard steel steel, which is very durable and well-made, small and light, and easy to carry. There are 2 functions in 21 pedals-passive volume and expression pedal, and automatically match the expression or volume function by outputting the object of the excuse. You can control multiple tone effects such as sustain, delay, and chorus. 3. It can work without battery or pedal , and can be widely used for guitar, and other musical instruments. 4. Automatically detect and capture the output source (EXP / Vol) objective lens 5. Input the 1/4 inch mono audio jack to connect to the instrument, and output the 1/4inch stereo audio jack for signal output. When used as an expression pedal, connect a stereo 1/4 cable from the pedal output jack , And keep the input jack disconnected. Colour:Orange Material:steel Size:1485 x 655 x 61mm Package Contents: 1 * Guitar effect pedal Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.