Features: Red and White wire used for "normally open" setup (circuit is closed and on when pedal is pressed) Black and White wire used for "normally closed" setup (circuit is normally closed and on....cuts off when pedal is pressed) Better quality and durability than switches. Specification: Product Name: Foot Switch Switch Size: as the picture show Housing Material: Plastic Color: Black Contact Material: Copper Cable Cord Length: 130mm approx Switch : Momentary Maximum Voltage: 250V AC (32V DC) Maximum Current: 10 Amp Operating Temperature: -20c ~ 60c Wiring: White - Common In (COM) Red - Normally Open (NO) Black - Normally Closed () Package List: 1 x Foot Switch Note: Due to the differee between different monitors, the picture may not reflect the actual color of the item. Thank you! Manual measurement, please allow 1-10mm error. Thanks for your understanding.