In daily life, music doorbell is very common, the tune is fixed and drab.
Chinese designer, Li Jianye designs a "piano doorbell" which only with 5 keys, but also can play beautiful melody. Different visitors can play different tunes, so the waiting time will be no longer boring.
If your agreement in advance, also can tell the master "who am I", that is very interesting.
But the doorbell should be set higher, because some naughty children will play your doorbell at anytime.
Written by Dora Men
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