Technology | Facts | History on Instagram: "Smartphones create vibrations using a tiny internal motor, usually an eccentric rotating mass (ERM) or a linear resonant actuator (LRA). In ERM systems, a small off-center weight spins rapidly, creating vibrations as the uneven mass moves. In newer LRA systems, a magnetic component moves back and forth in a straight line, producing quicker, more precise vibrations. The phone’s software controls the motor’s timing and intensity, allowing different vibra