Bluetooth Low Energy

Wireless carbon dioxide CO2 logger

Efento wireless carbon dioxide (CO2) logger measures gas concentration and transmit its values over Bluetooth Low Energy. On top of the gas concentration, the logger also measures temperature, humidity and barometric pressure. 

You can use a free mobile application to configure the device and read the data from its memory. If you add Efento Gateway, you can build a remote monitoring system.

  • CO₂ concentration monitoring: 400 to 5,000 ppm, with accuracy of ±(30 ppm + 3% of the reading)
  • Temperature: -15 to +70°C, accuracy: up to 0.4°C
  • Humidity: 0 to 99% RH, accuracy up to 4% in the range of 0 to 80% 
  • Atmospheric pressure monitoring: 300 to 1250 hPa measurement range with ±0.5 hPa accuracy
  • Battery ensures up to 5 years of maintenance-free operation
  • Configurable intervals & instant alarms: Flexible logging (1 minutes to 30 days) with immediate alerts when safe thresholds are breached
  • User configurable alarm thresholds. If any of the thresholds is exceeded, sensor will send the data to the platform immediately
  • The device stores 40,000 measurements in its memory, when the memory is full, the oldest measurements are overwritten
  • Add Efento Gateway and Efento Cloud to build a real time monitoring system.  The maximum distance between the sensor and the Gateway is 100 m in the open space and 20 – 30 m in the buildings
  • Use a free mobile application to configure the logger, read the data from its memory, generate reports and set alert thresholds
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CO<sub>2</sub>, atmospheric pressure, temperature and humidity
Efento NB-IoT sensor - back tapes
Efento NB-IoT sensors - dimensions

Key features

Efento Cloud

Together with Efento Cloud, the sensors enable constant monitoring, alerting about exceeding safe limits, generating reports and analyzes.

Long battery life

Loggers have been designed to work for up to 10 years on batteries. You do not have to remember about changing the batteries frequently or troublesome batteries charging.

Lower costs

Choosing wireless sensors and a cloud platform reduces the installation and maintenance costs.

Wide range of sensors

Efento sensors can measure various physical and chemical values. If you decide on one sensor today, you can expand your sensors fleet to another types anytime you want.

Integration

Standard communication protocols allow integration with any cloud platform  or mobile application.

Easy set up

All you need to set up a logger is a smartphone with a free mobile application. The whole configuration takes no more than 15 minutes.
Automatic CO2 sensor calibration
Logger automatically calibrates the CO2 sensor based on the barometric pressure sensor and the concentration of CO2 in the atmosphere
Data security
Data transmitted wirelessly can be encrypted. Thanks to that, unauthorized persons cannot hijack the communication between sensors and other devices. Efento sensors' software can be updated over the air, which will allow you to easily install any security patch that is released.
Integration
We believe that the Internet of Things is about integrating data sources, analysing the data and drawing conclusions based on it. If you want to integrate Efento loggers with your software, cloud platform or mobile application, we will provide you with the necessary documentation, libraries, SDKs and we will gladly assist you.
Sensor’s passport
Sensor’s passport documents the entire lifecycle of a device. By accessing the data on Efento Cloud platform, the user can check all information about the sensor: date of sale, warranty status, date of calibration, information on all service activities. In addition, the user can download all documents regarding the device – a duplicate of calibration certificate or service protocols.
CO2 SENSOR

400- 5000 ppm

Accuracy: ±(40 ppm + 5 % of reading)

Measurement interval: 1 minute to 10 days, configurable

Memory size: 40 000 measurements
TEMPERATURE SENSOR

Range: -15° to 70°C

Accuracy up to 0.4°C

Resolution: 0.1°C

Drift: <0.1°C / year

Measurement interval: 1 minute to 10 days, configurable

Memory size: 40 000 measurements
HUMIDITY SENSOR

Humidity: 0 to 99% RH

Accuracy: 4% in the range of 0 to 80%

Hysteresis: +/- 1% RH
PRESSURE SENSOR

Range: 300 to 1100 hPa,

Absolute accuracy +/- 3 hPa at 0 to + 65°C, relative +/- 0.12 hPa at 0 to + 65°C, p = 800 – 900 hPa
RADIO MODULE

Communication: Bluetooth Low Energy (BLE)

Radio frequency: 2,4 GHz

Power: 2,5 mW (4 dBm)

Range: up to 100 m (LOS)

Communication standard: Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)

Transmission frequency: 1 s
POWER SUPPLY

Package of 3 x AA, 6300 mAh (replaceable)
Battery operating time: up to 5 years

USB 5V with 1000 mAh rechargeable
battery
DIMENSIONS

124x60x26 mm

Weight: 0,13 kg

NOT SURE YET?

Order a starter kit - $165 only

The offer is dedicated to companies only.

Check it yourself. The starter kit includes all you need to test Efento wireless sensors and Efento Cloud platform:
- NB-IoT temperature and humidity sensor
- Efento Cloud access
- Free shipping worldwide

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Our customers

Newsletter September 2026

New gateway BLE/LTE for transport
The device features an IP67 enclosure and transmits data from compatible BLE loggers directly to the cloud.
Power supply: 5V DC / 1A, USB-C, backup battery: LI-Po, 3200 mAh (up to 12 hours backup power).

Efento Cloud for hospitals – safety, savings and full control
A hospital consists of thousands of processes, devices, and rooms whose proper functioning is essential for patient safety. One of these is ensuring proper storage conditions for medicines, vaccines, medical supplies, and laboratory samples.
Efento devices can also monitor gas and liquid pressure, water leaks, and visitor footfall.
Efento Cloud enables automated monitoring and control.
Automated pressure warning systems
Pressure sensors are installed in water, oil, chemical, or compressed air pipelines for continuous pressure monitoring. In the event of a pressure issue, a PLC controller operates a pump or valve to immediately increase or decrease the pressure. However, most pressure sensors only provide control signals and lack alerting capabilities.
Differential Pressure Monitoring in Vietnam
The facility was originally equipped with analog differential pressure gauges, which did not allow for remote monitoring or automated record-keeping to document production conditions.
Is it necessary to archive reports from the Efento system?
Data from temperature loggers used in the storage and transport of vaccines must be kept for at least 5 years. In the case of the Efento system, measurement data from the loggers is stored for 6 years. To ensure that nothing is lost (e.g., due to a failure), it is simultaneously saved in two independent data centers (AWS servers).
We were busy deploying 150,000 NB-IoT sensors – The Things Conference
The 9th edition of The Things Conference—the premier global IoT event held on September 22–23, 2026, in Amsterdam—brought together over 2,500 experts from around the world.
We are proud to have been a Bronze Partner of this conference.

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