LoRaWAN temperature sensor 3-way DS18B20 – Rejeee Multiple External Temperature Sensor 8xx-9xx mhz

The Rejeee Multiple External Temperature Sensor is a LoRaWAN temperature monitoring device built around three external DS18B20 probes, designed for multi-point measurement in a single deployment—such as multiple zones in cold storage, different areas in a warehouse, or multiple measurement points in a technical room. The waterproof external probes can be placed exactly where temperature matters, while the main unit can be mounted in a more protected spot.

Using LoRaWAN, the device can transmit temperature data over long distances, which is ideal where Wi-Fi coverage or cabling is impractical. It’s engineered for low power consumption and runs on lithium AA batteries (ER145052); the text cites up to 5 years of operation at a 10-minute reporting interval (@SF9). That makes it a strong fit for low-maintenance, long-term monitoring deployments.

Common real-world use cases include temperature monitoring for refrigeration and storage equipment (cold rooms, fridges, storage zones), buildings and technical rooms (computer rooms, equipment areas), and greenhouses where you want to track temperature variation across multiple spots. When paired with backend rules/alerting, it can trigger notifications if temperatures exceed safe limits and provide a usable temperature history for quality and compliance workflows.