RiKO PK3 Photo Sensor Qualified Sensors From Taiwan RiKO Power indicator, Motion indicator, NO/NC Switch, sensitivity adjustment. Sensing distance: Through beam 5 M. Diffuse reflection: 30 cm. Retro reflection: 2 M. NPN.NO/PNP.NO. Response time: 1.5ms Max. Custom design is welcome. We have updated our new catalogues on our website.