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Ignoring road safety issue, more people tend to wear headphones while hanging out or doing sports. So we designed Silence Guard to ensure users can hear the surroundings at pivotal moments. It is a smart sticker equipped with sensors in order to detect the sudden change in relative velocity and noise. If there is abnormality, Silence Guard will mute the original sounds in headphones and put the outside sounds through by sending electrical signals using Bluetooth technology. Stick it to your headphones and your own safety guard is on duty. In addition, The sticker can be cut into any shape. Multiple color and pattern choices are also provided.