1. Why make the appearance of the watch? <br>Ans: We want to take into account the clear reception outside sounds, try not to burden the body, and finally set to watch for the appearance. <br>2. How does this remind deaf watch the outside world has a huge sound? <br>Ans: We think there are several methods: micro-current, light, vibration in several ways, the final decision by vibration to alert deaf.
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