Rejeee LoRaWAN CO2 Sensor with 2.9-inch E-paper

RejeeeSKU: RM-JRIT-003
Manufacturer #: SL311US

Price  :
Sale price $89.99

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Stock  :
In stock (498 units), ready to be shipped

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  • LoRaWAN 1.0.3, Class A/C Compatible
  • Built in 5400mAh Li-battery, Up to 1 year
  • Type C for Local Configiration and External Power Supply
  • External 3dBi Antenna, Sensirion STH 30 High Sensitivity Sensor
  • 2.9-inch E-paper Display, Customized Company Logo

Rejeee SL311 is long range low power CO2 sensor together with temperature and humidity, based on Semtech SX1262/SX1268, with built in 5400mAh Li-battery which can last up to 1 year. With Sensirion high sensitivity sensor to ensure high reliability and long term stability. The sensor is widely used in various applications like smart agriculture, industrial environment monitoring and smart farm etc. Can easily connect to TTN and Helium network.

LoRaWAN Sensor

Mounting Bracket




Parameters Feature


Wireless LoRaWAN(SX1262/SX1268)

Encryption AES128 Optional

Battery Built-in Li-battery (Changeable, and No Recharge)

Battery Capacity 5400mAh

Working Temperature -45℃~+ 85℃

Working Humidity 0-100%RH

Communication Half duplex

Response Time Less than 15 Seconds

CO2 Measuring Range 400ppm-5000ppm

CO2 Accuracy ±(40ppm+5%)

E-Paper Temperatur 0℃~+ 50℃

Lifespan 1 Year, Data Uploading for Every 10 mins

Data Speed 300bps-62.5k bps

Size 102mm*60mm*25mm

TX Power 22dBm Max

RX Sensitivity -140 dBm

FrequencySX1268: CN470

SX1262: EU868 / US915 / AS923

Customer Reviews

Based on 1 review
nice monitor at a decent price

I got this to check out as a lower cost alternative to the Aranet4 and compared them side by side for a few days, including in a bowl with variable CO2 (supplied by seltzer). They stayed consistent within the error tolerance of both. It's a little less accurate than the Aranet4, and isn't as easy to get data from (the Aranet has a phone app, the Rejeee needs LoRaWAN or wired, and you have to send serial commands), but it does have an "update now" button that Aranet doesn't, and costs less than half as much. If your main goal is to estimate ventilation characteristics of a room this is an economical choice of meter. Seems like pretty solid construction.

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