Maniacal engineer Colin Furze has a problem. He spends so much of his time working in the shed, or down in his bunker, that he often can't hear his doorbell. He's missed a lot of packages over the years, so he's finally solving the problem the way he solves all his problems: with over-engineering. Enter the Colin Furze Doorbell.
The Colin Furze Doorbell System, or CFDB500C, has three parts: a home doorbell, a shed doorbell, and a bunker doorbell, each optimized for that space. Each part also has a light, in case Furze goes deaf which, considering his penchant for explosives, is not out of the realm of possibilities.
Hopefully he will finally be able to get his packages on time, because if this doesn't work I don't know what will.