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The Oombrella is an app-connected umbrella which sends a distress signal to your mobile phone if it is left behind. The invention, which costs $89, is on display at the CES technology show in Las Vegas. Its creator, Clement Guillot, explains how the Oombrella works to the 麻豆社's Roger Hearing. (Image: A woman holding an Oombrella. Credit: Oombrella)
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