The PA-6800 series ceiling mount PIR sensors combine a discreet compact appearance with outstanding performance at a low price. The sensor can be snapped in and out of its base unit for easy installation. ceiling mount design 2m to 4.9m installation height detachable base unit with snap-in-out sensor design pulse count and sensitivity adjustable geared mirror array for precise area definition (PA-6812E/6820E) PA-6810E and PA-6812E also available in black (BL)