The NV780MR provides a pre-entry protection solution while keeping the perimeter free from movement , designed to protect exterior/interior walls and doors or windows . NV780MR rugged indoor/outdoor detector incorporates two double passive infra-red side by side detectors (right and left view) , independent of each other with seperate anti mask detection for each side . The optics are specially designed to provide multiple narrow beams for excellent detection covering up to 12m for each side . Range adjustment is performed by adjusting the viewing angle of the bottom facing beams (moving them up and down). The detectors are configurable to report as a single unit (two side detectors reporting to a single zone output) or as dual units (each side reporting to a seperate zone). Two double passive infra-red motion detector .