Passive infrared (PIR) motion detectors sense changes in infrared energy from moving people or objects, while dual-technology detectors combine PIR with microwave sensing and typically require both technologies to detect activity before sending an alarm. IP-connected motion detectors communicate over a network, often using Power over Ethernet (PoE), and can integrate with video management systems, cameras, lights, or other smart devices.

Choose ceiling-mounted motion detectors for discreet placement and broad, 360-degree coverage in rooms, while wall-mounted models provide directional coverage and flexible wall or corner installation. Consider the room layout, mounting height, detection pattern, pet-immunity needs, tamper exposure, and whether the detector should connect to a hardwired or wireless security system.

Pet immunity helps reduce alerts from animals, while tamper protection supports installations where a detector may be accessible, such as homes, schools, retail spaces, and public areas. For challenging environments, consider motion detectors with digital signal processing, temperature compensation, sealed optics, or dual-technology sensing to help limit false alarms from pets, changing temperatures, drafts, insects, or other sources.

Before installing motion detectors, confirm whether each unit uses 12V DC, a battery and wireless connection, or Power over Ethernet (PoE) and IP communication, then verify terminal wiring, polarity, tamper circuits, and any required end-of-line resistors. Review compatibility with the alarm panel, video management system, or automation platform, along with supported outputs and communication methods, so the detector can send alarms or trigger connected devices as intended.