Here are some suppliers of the device (M5Stack AtomS3):

Most mobile homes already have USB ports. These can be used to power the sensor. All you need is a USB-C cable of the right length.

Modern car radios usually have one or more USB ports. If you want to use one of those, you may need to use a USB data blocker, otherwise the car radio may display an error message.

If there is no USB port available at the intended installation location, but a 12V line is available instead, an Atomic RS232 Base can be used.

The sensor can then simply be plugged onto this base.