> For the complete documentation index, see [llms.txt](https://help.aranet.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.aranet.com/base-stations/base-stations/firmware-and-hardware/power-supply-options.md).
# Power Supply Options
There are 2 ways to power the Aranet Pro Plus/Pro Plus LTE base station:
1. TDAPOE03 – Active PoE 802.3af injector for powering Aranet PRO Plus/PRO Plus LTE or other PoE 802.3af compliant device.
2. PoE 802.3af compliant Ethernet switch
{% hint style="info" %}
Aranet PRO Plus can shut down and switch off safely in case of a main power failure. System notification will
be sent as email and/or SMS to the destination configured by users belonging to the Administrator group.
{% endhint %}
#### For Aranet Pro base station
1\. AC/DC power adapter - included in the original packaging box with the device:
* DC male jack size: 5.5 x 2.1mm connector, center pin positive;
* output: 12VDC and 0.5A
2\. Passive PoE injector with 12V DC and 0.5A on the output and pinout wires 4-5 for VDC+ and wires 7-8 for VDC- (ground):
#### Internal battery backup
Aranet PRO is supplied with built in battery backup providing up to 30 minutes of power supply in case of
a main power failure. It is meant only as a backup and allows Aranet PRO to shut down safely. System
warning (if enabled) will be issued in case of main power failure and before Aranet PRO switches off
completely. Warning will be sent as email and/or SMS to the destination configured by users belonging to
the Administrator group.
| Pin at device | Data | PoE |
| ------------- | ---- | ---- |
| 1 | Rx + | |
| 2 | Rx - | |
| 3 | Tx + | |
| 4 | | DC + |
| 5 | | DC + |
| 6 | Tx - | |
| 7 | | DC − |
| 8 | | DC − |
In case the Aranet Pro device is powered simultaneously via both Ethernet and DC ports, then the device will select the power supply with the higher voltage level as the active power source.
If a third-party power supply source is used with the Aranet Pro base station, it should provide stabilised 12VDC and 0.5A on the output. The maximum voltage level connected to the device should not exceed 14V DC, as above this level device can be irreversibly damaged and burn down.
In case it is necessary to power the Aranet Pro base station from a car cigarette lighter socket, then a suitable adapter is needed:
1\. For 24V car batteries (trucks) - power adapter with 12 - 24 V DC converter to stabilised 12V in the output;
2\. For 12V car batteries – 12V power adapter with 12V voltage stabilisation in the output (note that when the car is running, its battery can provide up to 14V DC).
---
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