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Safe Earphone is designed for those who like to listen to music on the street. An internal sound detection unit only detect the sound like friction between tire and ground, horn, scream and brake. If the sound detection unit catches any of those dangerous sound, it will notice the vibration unit, then your earphone will start to vibrate. Both sides of Safe Earphone can vibrate, therefore, you can get the idea that which direction does the danger come from.
Zhongyan ZHU, Shouqian SUN
Gonglue JIANG, Ke ZHAO