BOSS FV-500L Volume & Expression Pedal. I have confirmed that both the volume and expression functions work correctly. A separate "stereo standard cable" is required when using it as an expression pedal. Please check the manufacturer's website for details. The instruction manual can be downloaded from the manufacturer's website, but I will include a printed copy. There are scratches, but the pedal movement is smooth, and there are no problems with its use. Velcro is attached to the bottom. Please check the photos. Since this is a used item, please refrain from purchasing if you are sensitive to such things. Please read the profile to prevent any trouble. Thank you. Excerpt from the manufacturer's explanation: ■ Volume Pedal Low-impedance type that supports stereo input/output for effectors and synthesizers. ■ Robust body made of aluminum die-cast and a non-slip rubber pad on the pedal surface. Achieves reliable operation and excellent durability. ■ Can also be used as an expression pedal by connecting with a stereo cable. Also equipped with a tuner out terminal on the side and a minimum volume knob to adjust the minimum volume. ■ Input/Output: Input x 2, Output x 2, Expression Jack, Tuner Out ■ Dimensions, Weight: 110W x 289D x 71.5Hmm, 1.2kg