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Dual side anti-masking detection - Active IR detection, fast 20 seconds detection designed for outdoor detecting sprayed liquids and blocking items up to 25 cm (10 in.)Wireless frequency selection NV780MR support two internally selectable frequenciesPet Immunity capability, up to 40 kg (90 lb)4 dual element sensors arrangementHigh efficiency long focal point (1.77 in.) LoDiff lensCombination optics - mirror and Fresnel Lens for optimal sharp detectionSingle or Dual operation modesOptical and digital range adjustmentsDual LED and buzzer indicatorsWall-mount, with built-in level tool