The BOSS FS-5U is a footswitch for guitar effects pedals, with polarity settings. - Model Name: FS-5U - Brand: BOSS - Polarity: POLARITY Momentary Guitar Bass Effects Pedal Pedal Switch Pedal Guitar Bass Please check my profile. Operation confirmed. Please make your judgment based on the images. Please purchase only if you understand that this is a used item. Please do not purchase if you are sensitive to imperfections.