A trace antenna is an antenna made out of a small strip of copper wire on the PCB which just happens to resonate at certain frequencies. This could be intentional, like an F antenna design for 2.4 ...
Surface mount devices have gotten really small, so small that a poorly timed sneeze can send your 0603 and 0402 parts off to ...
No user-serviceable parts inside? Give me a break! The head unit is tough to get to, but the PCBs within the chassis use ...