There are some Ancient Astronaut theorists that claim that this relief shows some type of ancient communication device (ancient Blu-Tooth). It's more than likely that it's really just a fancy earring or other decoration. Why would extraterrestrials, far advanced than us, use equipment that's identical to ours? Wouldn't they have something also far advanced? This phenomenon is a mistake AA theorists have made for decades now. Yeah, it's unsual, but not necessarily alien!:
Easter Island heads have bodies. The dirt and debris partially burying the statues was washed down from above and not deliberately placed there to bury, protect, or support the statues the statues were erected in place and stand on stone pavements.