# Safety guidelines

## General

* Always **read the full user manual** before using the device.
* The loggers must be used only for their intended purpose: to measure physical or environmental values and wirelessly transmit these measurements to a phone or a network gateway, under the operating conditions described in the manual.
* Do **not** perform modifications, unauthorized repairs or internal alterations to the loggers or their enclosures - doing so voids warranty and may create safety hazards.
* **In case you have any questions, please contact our technical support at** [**help.efento.io**](https://help.efento.io)

## Battery safety

* When [replacing the battery](/efento-ble-loggers/installation/replacing-the-battery.md), ensure proper battery orientation and **use only approved battery type** - a single **AA-size battery, type ER14505, 2700 mAh, 3.6 V**. Improper battery insertion may cause damage or risk of fire / explosion.
* Never use **damaged**, **deformed** or **otherwise compromised** batteries.
* **Do not puncture, crush, or apply pressure to the device.** Physical damage may compromise the battery’s integrity and lead to leakage, overheating, or failure.
* **Do not recharge the battery**
* In case of battery malfunction or battery leakage **discontinue use immediately**; do not attempt to repair.

## Environmental / Operating conditions

* Do not expose the logger to **temperatures outside its specified operating range**. Exposing the device to extreme temperatures (too low, too high) may cause malfunction, damage, or loss of measurement accuracy.
* Store the device **protected from direct sunlight, heat sources, fire**, or other harsh environmental conditions.
* Avoid exposing the logger to **moisture, corrosive substances, or harsh chemicals** - unless the specific model is designed for such conditions (e.g. waterproof probes).

## Installation and maintenance

* During logger installation, be sure to follow the [installation guidelines](/efento-ble-loggers/installation/logger-specific-installation-guidelines.md) and [best practices](/efento-ble-loggers/installation/installation-best-practices.md) to ensure optimal performance and accuracy.
* Do **not** disassemble or tamper with the internal electronics of the logger. **Only perform maintenance recommended by manufacturer** (e.g., [battery replacement](/efento-ble-loggers/installation/replacing-the-battery.md)).
* IP30 devices should be cleaned using dedicated electronics-safe cleaning products (such as those used for computers) or, alternatively, with a suitable disinfectant.
* IP67 devices installed in rooms may be cleaned using the same methods applied for room cleaning, provided that the water pressure does not exceed **100 kPa (15 psi)**.


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