> For the complete documentation index, see [llms.txt](https://docs.aethlabs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aethlabs.com/microaethalometer-tm-ma450/quick-start-guide/03-powering-the-ma450.md).

# Powering the MA450

The MA450 uses external power only (no internal battery).

1. Connect the M8 sealed circular connector cable of the 12V outdoor rated power adapter to the MA450 circular M8 connector labeled 12V DC IN.
2. Plug the AC adapter into a power outlet.

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If the optional built-in Nafion dryer is installed, a second external power supply must be connected for the dryer system.

1. Connect the second M8 sealed circular connector cable of the 12V outdoor rated power adapter to the second MA450 circular M8 connector labeled DRYER 12V DC IN.
2. Plug the AC adapter into a power outlet.