Photo-electric multi-function emitter + receiver sensor / switch pair with through-beam / diffuse / retro-reflective sensing + background suppression + divergent LED beam + adjustable sensitivity - Balluff - model BOS 21M-UUI-RP30-S4 - red LED beam light (633nm) - Pre-equipped with a 4-pin M12 male connector - 2 x digital outputs (PNP/NPN transistor/push-pull transistors; 100mA) (NO (Normally Open) or NC (Normally Closed) operation) - Rectangular shape - 10-30Vdc (12Vdc / 24Vdc nom.) supply voltage - Rated for +23...+131°F / -5...+55°C ambient - IP67 - Die-cast Zinc housing (painted) + Aluminium housing + Glass housing + PC (polycarbonate) housing + Glass sensing surface - 1000Hz / 1kHz max. switching frequency - Surface with through-holes (M4 screw) mounting - with IO-Link communication capability - sensing mode selection - count function - equivalent to BOS21MUUIRP30S4