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IMHO very little....

 

As I see it, the DualTow is an exploration in using belts as a display element in an horological context.  It makes quite a spectacular but exceedingly expensive watch.

The Tread is in my eyes an exploration is making a spectacular watch, outside of the context of watchmaking.

If I am correctly informed the Tread needs to be recharged at least once a month.  I do not know the size of the battery, but considering the size of the watch I expect it is a standard cell-phone battery of around 750mAh.  So using 750mWh it will run about 30 days.  A standard quartz chrono has the same amount of motors as the Tread, is a wearable size and has a battery of maybe 45mAh with which it runs about 3 years.  A little more work on the part of the developers would certainly have found motors that use less current.  I bit there is a power gobbling microprocessor in there running the whole show using milliwatts.  An horological microprocessor uses nanowatts.  Look and you will find.

Maybe I am all wrong, but as an electrical engineer who has some idea of what low power is, I can see no reason why it needs so much energy to run.

I will readily admit, the Tread is a spectacular watch, but otherwise it is IMHO a standard US development such as we unfortunately so often see.  Don't try to make something that is technically advanced, make something that is spectacular, but cheap. 

(on the other hand I am with them in using polycarbonate for the crystals.  Despite their marketing, it is not high tech, being in all our glasses since the '70s of the last century if not before, but the folly of grinding saphire in all possible forms just drives prices through the sky.  And as we know from our glasses, good polycarbonate lenses with antireflection and surface hardened can take some punishment.  And when necessary they can be inexpensively replaced.  That said I also find the Tread expensive for what it is.)

Don

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