> For the complete documentation index, see [llms.txt](https://docs.efento.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.efento.io/efento-ble-loggers/using-loggers/standalone-mode/batch-actions.md).
# Batch actions
The Efento mobile application allows performing certain actions on multiple sensors simultaneously. Three batch actions are available:
1. **Set device time / synchronize time on multiple devices** – Synchronize the time on the selected loggers so they measure and record data simultaneously. This is useful, for example, in temperature mapping, as all loggers’ values will be aligned in the reports.
2. **Generate a report from multiple sensors** – The app downloads data from the selected sensors one by one and generates a single report containing data from all devices. The report can be configured and shared in the same way as a regular [report from a single logger](/efento-ble-loggers/using-loggers/standalone-mode.md#exporting-the-data).
3. **Change measurement period** – Set a new measurement interval for the selected device(s). Optionally, you can clear the devices’ memory and synchronize their time by selecting the corresponding checkboxes.
To enter **batch action mode**, go to the list of nearby devices and:
{% stepper %}
{% step %}
#### Select the first device
Tap and hold the first sensor you want to include. It will be **highlighted in blue**.
{% endstep %}
{% step %}
#### Select other devices
Tap the other devices you wish to add.
{% endstep %}
{% step %}
#### Select the batch action
Tap the three dots in the upper-left corner and choose from the available batch actions.
{% endstep %}
{% step %}
#### Enter PIN codes
Enter the PIN code for each device. The PIN codes are printed on the devices’ enclosures. Once entered, the app will remember the code and will not ask for it again on the same mobile device.
{% endstep %}
{% endstepper %}
---
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