PIR detector with ball joint swivel bracket for ceiling or wall mounting. The lens is divided into 36 detection fields in three levels with 90° horizontal angle. The vertical angle is adjustable in 3 positions, +2 to -12 degrees. The detector, which is temperature-compensated, is pulse-counting and adjustable for 1, 2 or 3 pulses. The unit can be equipped with a special clip-on pattern mask (included) that prevents e.g. pets from accidentally tripping the alarm. Test function with disengageable LED indication (test function can be performed from the alarm centre).