Squaring the circle. Infrared presence detector Presence Control PRO IR Quattro COM2 for indoors, ideal for small offices, store, service and utility rooms, washrooms and WCs, installation height up to 8 m, for switching light as well as HVAC 'ON' and 'OFF', 1760 switching zones for excellent detection quality, square presence detection zone covering 16 m2, mechanically scalable.