This is a clear cut case of TTT or "Time Travelling Trolls".  The bell contains ultra long lasting battery technology from the future.  It won't stop ringing until the technology for the battery and time travel are discovered.  The company will arrange to go back in time to create this electric bell as an elaborate advertisement for the battery in the future.,(reply>), Same dudes that keep changing that lightbulb that has been burning for 120 odd years,(reply>), You make it seem like we don't understand this battery or why it is still working. We do, it draws very little current, ie very low amps. Thus, the battery is being drained incredibly slowly. No time traveling, quantum woo or magic needed.,(reply>), Mor chance of it being lost ancient technology discovered and sold between scientists/ professors to figure bit out but realised they would have to break it to do so and it is the only ancient technology we have found working. And it’s still going after all this time,(reply>), @Wira Yudha this is awesome.,(reply>), @Brogers_ Yes but do remember that the future, past and present can be changed.