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Features: -Three-wire system: brown positive; blue negative; black signal -Waterproof anti-jamming Application: This product is suitable for 3D printers, engraving machine, industrial automation equipment, industrial robot use. Specifications: SN04-N Color: Black & Green Voltage: 6-36V Current: 300mA Size: 35*17*17mm Cable Length: About 200cm Package included: 1x Switch Sensor