> 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/nb-iot-loggers/device-settings/bluetooth-turn-off-time.md).

# Bluetooth turn off time

You can set up the logger to automatically switch off the Bluetooth interface after a selected period of time. This increases the battery lifetime but you will not be able to connect with the logger and change its configuration with your mobile device. By default the Bluetooth interface is always on.

If the Bluetooth has been turned off, in order to enable it you either need to restart the device (switch it off, wait for 10 seconds and switch it on again) or turn it on remotely, from the server.

In order to set the Bluetooth turn off time:

1. Connect to the logger with Efento mobile application, tap on the three dots in the upper right corner -> “Power user” -> “BLE turn off time”


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