Photo Switch 1,Output:NPN or PNP,NO/NC; 2.Wiring:DC 2/3 wires,AC 2/3 ... directly with foreign similar products.2, Inspection mode:direct reflection,diffuse reflection,opposed type,and tank type,Shape:mainly round,pacake ... ,depend on different use occasions and measurement.3, Ouput:NPN,PNP(normal open or normal closed,current:100--300mA),relay,logicgate ...