Researchers at the University of Michigan and the University of South Carolina described in their paper how they could spoof capacitive micro-electro-mechanical systems (MEMS) accelerometers, which let a device know when they're moving and how quickly, by using simple acoustics. Through a $5 speaker, the team hit 20 accelerometer models from five manufacturers with sound waves from music files. They affected the information or output from 75 percent of the devices tested and were able to control 65 percent of them, reports the New York Times. The sound waves move the accelerometer sensor, which is suspended on springs, in such a way that the device thinks it is in motion.