【UPGRADE CHIP】: Our pedal used 3 printed circuit boards（PCB） to control the conversion of Two-Channel polarity switch. When the polarity switch changes, PCB can identify and stabilize the internal current of piano, so as to reduce the noise and achieve the best sound quality,enrich your digital piano tone. | 【Functional & Universal Sustain Pedal】: Polarity reverse switch, 6.3 feet cable with 1/4 inch standard audio port which widely used for Yamaha, Casio, Roland, Casio, Korg, Behringer, Moog and More MIDI keyboard, digital piano, electronic keyboard. | 【High Quality ABS Metarial & Premium Spring】:Instead of heavy rubber and plated metal, Sovvid adopted ABS aerospace plastic and alloy steel with high-quality spring, good quality, more durable, more use. | 【Stable & Anti-Slip Design】:The bottom with slip-resistant pads for protection of underfoot with enough resistance, grips the floor to keep the pedal perfectly in place. | 【365 Days Warranty】: Sovvid provides 365 days of after-sales service, if you are not pleased with your purchase and have some questions,please do not hesitate to contact us, Sovvid always here to assist you all the time.