Re: Prevent theft or missing of mobile phones
How about an audible alarm & light? It would use a lot less power than vibration. Most watches/phones already have the capability of both so it would only require the proximity detector. Although I must admit ever since cell phones came out I no longer where a watch since my phone has a clock. Product research would be needed into that. I like the smart chip idea in the watch so that the phone will not operate.
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