Natural feel, perfect response - Universal sustain pedal with chrome pedal for natural and realistic pedal action Universal compatibility: design with a conveniently located polarity switch for compatibility with all electronic keyboards Robust and Reliable - Premium construction features a sturdy, sturdy mechanism for uncompromising reliability Designed to move: Lightweight, ultra-compact aesthetics provide classic piano-like support while being portable Performance Driven Design: Specially designed rubber pads on the bottom of the pedals grip the floor and stay in place while you play Connectivity made easy - Includes 6ft cable with 1/4" plug for connection to virtually any MIDI keyboard, stage piano, or sound module that has a 1/4-inch sustain pedal input The SP-2 features a polarity switch on the bottom panel; when activated, the polarity of the pedal itself is reversed. This switch guarantees the compatibility of all keyboards and digital pianos. The customer most likely neglected to try to activate this switch before filing their complaint. The SP-2 features a jack cable, which is the industry standard for sustain pedals on virtually all electronic keyboards and pianos around the world.