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RE: Matrix Powerwatch - A smartwatch that charges with your body heat
Pros:
It has a thermoelectric circuit that converts into electricity the temperature difference between the part of the watch that touches the skin and the metal frame, which functions as a heat sink to keep cool.
It has Bluetooth to synchronize with the cell phone.
Monitoring of physical activity that the user can perform.
Waterproof.
Cons:
- It's expensive.