# Air Quality Sensor Power Requirements

Verkada [Environmental Sensors](https://docs.verkada.com/docs/sensors-quick-start-guide.pdf) use industry-standard 802.3af (Power over Ethernet \[PoE]). The average bandwidth consumption is less than 5 kbps. Verkada [Air Quality Sensors](https://docs.verkada.com/docs/air-quality-sensors-overview.pdf) may consume additional power when performing operations, such as firmware upgrades or initial calibration.

The table reflects the maximum power draw for a particular sensor model within the normal temperature.

{% hint style="info" %}
We recommended to provide an additional power budget on your switch for the sum of all of your sensors.
{% endhint %}

|                                                                        |                                |
| ---------------------------------------------------------------------- | ------------------------------ |
| **Model**                                                              | **Normal Operation (802.3af)** |
| [SV11](https://www.verkada.com/sensors/sv11/)                          | 4W                             |
| [SV21](http://sv21)                                                    | 3W                             |
| [SV23](https://docs.verkada.com/docs/air-quality-sensors-overview.pdf) | 3W                             |
| [SV25](https://docs.verkada.com/docs/air-quality-sensors-overview.pdf) | 3W                             |