Fork-shaped light photo-electric sensor / switch with through-beam sensing + 2mm gap / passageway + divergent LED beam + adjustable sensitivity - Balluff - model BGL 21-RG - red / green light (636 / 536nm) - Pre-equipped with a 4-pin M8 male connector - 1 x digital output (NPN transistor; 100mA) + 1 x digital output (PNP transistor) (NO (Normally Open) or NC (Normally Closed) + light-ON / light-OFF setting operation) - U-shape body - 10-30Vdc (12Vdc / 24Vdc nom.) supply voltage - Rated for -4...+140°F / -20...+60°C ambient - IP65 - Anodized Aluminium housing + Glass sensing surface - 25000Hz / 25kHz max. switching frequency - Surface with through-holes (M4 screw) mounting - equivalent to BGL21RG