PIR motion sensor HEIMAN WS3MS Wi‑Fi Tuya compatible — passive infrared occupancy detector

Heiman WS3MS Tuya smart PIR WiFi motion sensor is a compact indoor motion detector that connects via 2.4 GHz WiFi and sends instant notifications to your mobile device. The sensor uses an infrared PIR element with automatic threshold adjustment and automatic temperature compensation to maintain stable detection performance over a wide temperature range. It supports pet immunity for animals up to 11 kg and has a detection range up to 9 m with a 90° coverage angle. Powered by one CR123A battery (DC 3V), the WS3MS is intended for simple, tool-free installation and blends into modern interiors.

Advantages

The Heiman WS3MS provides real-time motion alerts over WiFi and keeps sensitivity stable through automatic threshold adjustment and temperature compensation. Its pet immunity reduces false alarms from small animals, while the 9 m detection distance and 90° angle allow monitoring of larger indoor areas. Installation is straightforward with stick-and-play mounting, and the sensor’s compact design fits most interiors.

Key specifications

• Manufacturer: Heiman
• Model: WS3MS
• Operating voltage: DC 3V (1× CR123A battery)
• Detection distance: ≤9 m (at 25°C)
• Detection angle: 90°
• Sensor type: Infrared sensor (PIR)
• Network: WiFi 2.4 GHz
• WiFi protocol: IEEE 802.11 b/g/n
• Operating temperature: -10°C to +50°C
• Operating humidity: ≤95% RH (non-condensing)
• Pet immunity: up to 11 kg
• Dimensions: 80 mm × 28.5 mm

How to use

Place the Heiman WS3MS on a stable surface or mount it using the supplied stick-and-play adhesive in the area you want to monitor, at a height and angle that provide unobstructed coverage of the target zone. Insert one CR123A battery (DC 3V) following polarity marks, power the device, and complete WiFi setup using the compatible Tuya app or an integrated smart home platform over 2.4 GHz. After connecting, test detection by walking through the monitored area to confirm notifications and adjust position if necessary.

Recommendations

For reliable operation, install the sensor away from direct air flows (vents, fans) and strong heat sources, and avoid placing it behind glass or objects that obstruct the infrared path. Use the Tuya-compatible app for firmware updates and sensitivity settings, and replace the CR123A battery when low battery notifications appear.