The Mu Tags are tiny “loss prevention” smart-tags that track the location of the items they are placed on. Mu Tags even allow you to create safe-zones, so when a certain tag leaves the zone, you’re alerted immediately. Each tag is ridiculously small (the
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Although the tone of the doorbell is not as monotonous as before, it is still different from piano. However, China's designer Li Jianye gives us a piano doorbell. This product has several piano keys which allow the guest to play what ever tone he likes.