Passive Infrared ceiling detector (360º). Spherical fresnel lens. Range of 8 to 12 m, in diameter, for a height of 2.4 to 3.6m (62 zones). Sensitivity from 1.6º C to 0.6 m / sec. Optional alarm indicator. Pulse counter (approx 20 sec.) 2 or 4. RFI protection (20 V / m from 100MHz to 1 GHz). Power 9.5 - 18 VDC, consumption 18 mA max. GRADE 2.