The shell is made of high-strength hard steel, which is durable, well-constructed, compact, and lightweight for easy portability. This pedal features dual functions: passive volume control and expression pedal operation, automatically matching either expression or volume functionality based on the connected output device. It allows control over various tone effects such as sustain and delay. The pedal requires no battery or external power source and is compatible with guitar, bass, and other musical instruments. It automatically detects and identifies the output source (EXP/VOL). Connect a 1/4 inch mono audio cable from your instrument to the input. For signal output, it delivers 1/4 inch stereo audio. When used as an expression pedal, connect a stereo 1/4 inch cable from the pedal output and leave the input disconnected. Color: Orange Material: Steel Size: 148.5 x 65.5 x 61mm Package Contents: 1 x Guitar Effect Pedal Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement error is +/- 1-3cm.