Retro-reflective with M.S.R. function, Sensing distance When using the E39-R1: 0.1 to 2 m, Light-ON/Dark-ON selectable, NPN, Pre-wired models (5 m), Red LED (700 nm), Timer function, Turbo function.Sensing methodRetro-reflective with M.S.R. functionSensing distanceWhen using the E39-R1: 0.1 to 2 mLight sourceRed LED (700 nm)Connection methodPre-wired models.Sensing methodRetro-reflective with M.S.R. functionSensing distanceWhen using the E39-R1: 0.1 to 2 mLight sourceRed LED (700 nm)Connection methodPre-wired models