If you're using a pre-certified BT module, the costs can be dramatically lower than you might expect. Ditto doing your lab testing "over there" rather than in t

If you're using a pre-certified BT module, the costs can be dramatically lower than you might expect. Ditto doing your lab testing "over there" rather than in the US. If it's not an intentional radiator, you can get multiple rounds of FCC+CE testing for USD650 in Shenzhen these days.