The Quadrature of the Circle. Infrared presence detector Presence Control PRO IR Quattro DALI for indoor use, ideal for small offices, storage, utility, and laundry rooms, as well as restrooms and toilets. Installation height up to 8 m, with a digital DALI interface for controlling 2 light channels, 1760 switching zones for excellent detection quality, square detection with a 16 m² presence area, mechanically scalable. Live comfortably while saving energy. More quality of life, safety, and energy savings through intelligent sensor technology from STEINEL. Light on/off – automatically. Highly innovative sensors respond to movements and lighting conditions, automatically turning the light on and off after a set time. The infrared presence detector Presence Control PRO IR Quattro DALI features a unique square detection area and DALI interface. It allows for lighting control via constant light regulation and the option to keep a base brightness on, as well as for a second, independent light output. The sensor technology with 1760 switching zones ensures excellent detection quality: 4 x 4 m presence detection, 5 x 5 m radial detection, and 7 x 7 m tangential detection. The rectangular detection and the possibility of infinitely scalable mechanical range adjustment allow for highly precise planning. Adaptation to the specific usage situation is achieved through additional functions via potentiometers and remote control (IQ mode for automatic adjustment of the delay time to room usage, storage of two light scenes, base brightness, etc.) as well as DIP switches (semi/full automatic, constant light regulation on/off, etc.). The detection range can be extended through master/slave networking. Area expansions can be realized with Steinel Presence Control PRO COM1, COM2, and DIM. Optional remote controls allow for convenient installation and operation.