Presence sensor PNI HS402 Wi‑Fi with millimeter radar waves, detection range 10 m, motion detection

PNI HS402 Wi‑Fi presence sensor uses millimeter radar waves to detect human motion within a 10 m range. Designed for indoor monitoring and smart automation, the sensor provides non‑visual motion detection that works in low light and through partial obstructions. It connects to a local Wi‑Fi network for remote status reporting and can trigger alarms, lighting scenes or other smart home actions based on detected presence.

Advantages

The millimeter radar technology ensures reliable detection of small movements and respiration-level activity, improving sensitivity compared with many passive infrared devices. Wi‑Fi connectivity enables integration with existing smart home systems without additional wiring; the compact design allows unobtrusive mounting on ceilings or walls. The device operates independently of ambient light and is less affected by temperature changes or pets when configured properly.

Suitable for

• Home automation and presence-based lighting control
• Indoor security and alarm triggering in hallways, rooms and entryways
• Occupancy sensing for energy management in offices or meeting rooms
• Detection in low‑light, smoky or partially obscured environments

Key specifications

• Detection technology: millimeter radar (Doppler-based motion detection)
• Detection range: up to 10 meters
• Coverage: typically hemispherical or adjustable cone depending on mounting position
• Connectivity: Wi‑Fi network integration for status updates and remote commands
• Power: low-power design suitable for continuous operation (power specifics depend on installation)
• Mounting: ceiling or wall mounting for optimal coverage
• Detection capability: human presence, small motion and respiration-level movement

How to use

Mount the PNI HS402 at the recommended height and position for the intended coverage area, ensuring the sensor faces the monitored zone and is free from large reflective surfaces directly in front. Connect the device to the local Wi‑Fi network using the manufacturer's setup procedure or application, then configure detection sensitivity and integration options for alarms, lighting or automation scenes. Test detection across the target area and adjust orientation or sensitivity to reduce false triggers from pets or mechanical sources.

Usage recommendations

For reliable performance, position the sensor on a ceiling or high wall centered over the area to monitor, avoid direct alignment with large metal objects or mirrors, and configure sensitivity and exclusion zones via the setup app. Combine with smart home routines to act on presence events (lighting, HVAC, alarm). Periodically verify Wi‑Fi signal strength and update firmware when available to maintain secure and accurate operation.