Can something like this --
be used in a product without FCC certification? (Sending to an FCC lab etc).
I know the xmtr is only 10mw.
If I remember don't garage door openers and the like operate at 433 mhz?
Don't confuse licensing with compliance.
Your ENTIRE product must be tested/certified to comply with radiation
and conducted interference
specifications in the jurisdiction where sold.
If you are in compliance, you get to "legally" put stickers on it
that buyers require.
It's more about NOT radiating than radiating.
The TRANSMITTER is on top of that.
Radiation on the intended frequency is only part of the problem.
It must NOT exceed radiation limits on other frequencies.
Unlicensed merely frees the buyers from having to file paperwork
for each installation of the device or site.
If you're selling a component, as it appears the ebay link is...
It's to their advantage to have test results showing compliance,
but that does not relieve the system integrator of testing the system
Regulatory compliance is an expensive maze of regulations.
It's routinely disregarded for hobby stuff...until somebody calls the
FCC and says their TV is picking up interference.
But that does not make it "legal"...just too expensive to enforce.
If you intend to ship an end-user device without compliance stickers,
prepare to have it stuck in customs forever. They don't know or care
it actually complies. They want to see the stickers.
And there's a plethora of safety compliance issues in addition to the EMC
Are we having fun yet?