Bluetooth Low Energy
Wireless temperature logger
Wireless temperature loggers measure and transmit temperature over Bluetooth Low Energy. 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 temperature monitoring system for objects which need supervision such as medical refrigerators, pharmaceutical warehouses, museums, archives or goods during the transportation.
- Temperature: -35 to +70°C, accuracy: up to 0.4°C in the -20°C to +70°C range and 0.5°C in the -35°C to -20°C range
- Measurement period: 1 minute – 10 days (configurable by the user)
- The device stores 40,000 measurements in its memory, when the memory is full, the oldest measurements are overwritten
- Battery ensures up to 5 years of maintenance-free operation
- 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
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 5 years on battery. You can forget about changing the battery frequently or troublesome battery 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.Calibration certificate
At the customer’s request, each Efento sensor can be supplied with a calibration certificate in accordance with ISO / IEC 17025. The test is performed in an external, ILAC certified laboratory.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.Dedicated silicone cover
Loggers can be equipped with dedicated silicone covers which protect the devices against mechanical damages and water splashes. Silicone cover increases the protection level of the enclosure to IP42 level.
| TEMPERATURE SENSOR | Range: -35° to 70°C Accuracy: up to 0.4°C in the 0°C to +70°C range and 0.5°C in the -35°C to 0°C Resolution: 0.1°C Drift: <0.1°C / year Measurement interval: 1 minute to 10 days, configurable Memory size: 40 000 measurements |
|---|---|
| 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 |
| BATTERY | Battery: 3,6 V, size AA, capacity 2 700 mAh (replaceable) Battery operating time: at least 5 years (measurement interval: 15 min) |
| DIMENSIONS | 20 x 45 x 85 mm Weight: 0,055 kg |
Case studies
Implementation of Efento Cloud temperature and humidity monitoring system
Hospital pharmacy uses Efento Cloud for monitoring temperature and humidity in refrigerators and rooms where medical products are stored.
Archives of the Jagiellonian University
The Archives of the Jagiellonian University are one of the oldest and largest university archives in the world. Efento loggers measure temperature and humidity, ensuring control over the proper storage conditions of exhibits.
Integration of Efento sensors with TMS
Żabka Poland is the owner of the largest chain of convenience stores in Poland branded Żabka. In total, Żabka Poland has over 5 200 branches around the country.
NOT SURE YET?
Order a starter kit - $197 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:
- Efento Gateway
- Bluetooth Low Energy temperature and humidity sensor
- Efento Cloud access
- Free shipping worldwide
Our customers
Newsletter September 2026
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.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.
Subscribe to our Newsletter
You can unsubscribe at any time