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How does the RuuviTag actually work?

RuuviTag is an extreme low-power Bluetooth Low Energy sensor node that continuously measures temperature, relative air humidity, air pressure and acceleration.

Environmental variable measurements are taken every second, 24/7. After data is measured, RuuviTag prepares a Bluetooth message and broadcasts it out for nearby receiver to collect. The receiver can be a mobile phone or a gateway.

Even with sensor measurements and sending data every second the battery is expected to last up to 4 years. This means one battery has enough juice to measure and send up to 100 million times before running out of energy.