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Garmin HRM-Dual review: Simple, straightforward and with good battery life
The Garmin HRM-Dual measures both heart rate and heart rate variability, the latter of which is a measure of the variation in ...
Hackaday1y
Bluetooth Battery Monitors That Also Monitor Your Position, Without Asking
The device in question is a Bluetooth 4.0 Battery Monitor that is resold under many brands, and which by itself would seem to do just what it is said to do, from monitoring a battery to running ...