Bosch ISM-BLQ1 Motion Detector

The ISM-BLQ1 Quad PIR Detector uses two individual sensors that operate like two PIRs in one. Each sensor processes signals separately. Both must activate to cause an alarm. This increases reliability, because false alarm sources such as noise spikes and small animals are ignored. The ISM-BLQ1 has a broad coverage of 11 m x 11 m (35 ft x 35 ft) and a flexible mounting height from 2.3 m to 2.7 m (7.5 ft to 9 ft). No range or height adjustments are required. The sealed optical chamber prevents drafts and insects from affecting the detector.