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Most people have experienced accidentally dropping their phone, but if this patent goes into production, you no longer have to worry about your phone being broken. This system uses the accelerometer in the smartphone (that is, a micro-electromechanical system sensor, which has functions such as measuring acceleration and helping to switch the screen orientation) to determine whether the phone is in a fallen state. Once an alarm signal is received, the system will activate a micro-injection device to slow down the fall. process, and the airbag pops up, allowing the phone to "land" safely. However, for consumers who have chosen high-priced smartphones, it is also worth considering whether they will "invest" in the security protection of their mobile phones.