Specification:Product Name :Optical Sensor SwitchModel: HY301-21Output Type:Photo TransistorPeak Emission Wavelength: 940nmIR Diode Forward Current: 50mAIR Diode Reverse Voltage: 5VTransistor Power Dissipation: 75mWTransistor Collector Current: 20mAPhoto Transistor Collector-emitter Voltage: 30VPhoto Transistor Emitter-collector Voltage: 5VDiode Power Dissipation: 100mWOperating Temperature Range: -55~100 Celsius DegreeNumber of Pins: 4Slot Width: 3.67mm/9/64"Slot Depth: 7.85mm/0.31"Pin Length: 10.31mm/0.41"Total Size:21.8 x 12.1 x 6.2mm/0.86" x 0.48" x 0.24"(L*W*H)Detection distance is not adjustableDetection object ：opaque objectsDetection Distance:4.