Wow, this piano doorbell concept, while cool, would probably get really annoying really fast. I mean how many people are coming to your door that can actually play any sort of decent tune on the piano and how many songs can you really play with just five keys anyway? Neat idea in theory but probably not well suited for anything other than a piano school or piano teacher’s house.
labexp via Freshome
SadoTech Model C Wireless Doorbell Operating at 500-feet Range with Over 50 Chimes, No Batteries Required for Receiver, (White)