Matrix has PowerWatch 2 running on light and body heat
Matrix Industries' PowerWatch 2 uses body heat and solar to charge itself | VentureBeat
PowerWatch Series 2 | no-charge smartwatch from Matrix Industries - BikeRadar
Crowdsourced Smartwatch Runs on Body Heat | PCMag
Solar energy and your body heat is all the PowerWatch 2 smartwatch needs to run
Never Charge Again: Matrix Smartwatch Powered By Body Heat | GearJunkie
Matrix Industries' PowerWatch 2 uses body heat and solar to charge itself | VentureBeat
Ecg Ppg Smart Watch Men Body Temperature Wireless Charger Smartwatch Blood Pressure Oxygen Sport Fitness Tracker For Android Ios - Smart Watches - AliExpress
PowerWatch 2 is a body heat-charging smartwatch with few of its predecessor's flaws | TechRadar
Body Heat Powered Smart Watch
This Smartwatch Powered By Your Body Heat Never Needs Charging
Body heat could directly charge wearable devices | E&T Magazine
First Look: Body Heat and Solar Powered Matrix PowerWatch 2 GPS | DC Rainmaker