Sustain Pedal for Keyboard Universal, Premium Sustain Pedal, Piano Pedal for Keyboard with Polarity Switch for MIDI Keyboards, Digital Pianos, Yamaha, Casio and More, 1/4'' Input Plug by karmiero

How to use : Just plug it in and if the note is sustained without depressing the pedal than flip the switch on the side...no (for normally open) to nc (normally closed) or nc to no. but simply plug it in, turn on the keyboard and press a key to see ,only one switch to adjust to get it work correctly. Spring Design :The High quality spring design,featuring the kind of soft resistance,enables expressive playing. Polarity Switch : The sustain pedal side design polarity switch,it includes a 91inch with a 1/4 "(6.35mm) jack input,so you can easily move it under the piano to get it into the perfect position. Non-Slip Design : The non-slip design of the pedal ensures a firm grip on the floor, preventing slipping and unwanted movement during play. The rubber bottom provides a non-slip surface that secures the pedal in place. Premium Alloy : This universal sustain pedal is made of premium alloy and high-strength plastic, so it's super strong and stable,pedal action is smooth and responsive.