Switch on the side changes polarity so it compatible with most keyboards using a 6.35mm (1/4") mono jack plug. In full working order.
Cherub Sustain Pedal Cable for Keyboard Piano - WTB-004 good order bx7
Cherub Sustain Pedal Model WTB-005
Universal Piano Style Sustain Pedal with polarity switch
Electronic Piano Keyboard Pedal Universal Sustain Pedal Polarity Switch Non Slip
Donner DSP-001 sustain foot pedal for keyboard piano universal polarity switch
