This item was purchased as a beautiful, unused item a long time ago. It has been kept as a display piece. It is relatively clean. However, the back cover is missing. The Dual Foot Switch FS-6, capable of A/B mode switching, is designed to accommodate a battery. - Model: FS-6 - Type: Dual Foot Switch - Polarity Setting: A/B - Mode Setting: Mode A / Mode B - Internal Structure: Battery can be stored Thank you for viewing.