Voltage ratings on back-up camera assistant

I have a back-up camera assistant and monitor for my car, that came with a wireless (bluetooth) sender and receiver. On the wireless devicesit says that it works from 9VDC to 14VDC.
All devices are MADE IN CHINA.
My car throws out 14.5V when the engine is running.

My question is: do this devices still run on 14.5VDC?
Do they have a regulator built inside?

Thanks for your help.