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The Withings Go does most of what you'd expect an activity tracker to do. It counts your steps, it tracks your calories, it measures how far you've traveled. But you'll be more interested in the Go for what it doesn't do: Run out of battery.
The Go will last as much as eight months without needing a recharge. That's an entire NBA season. It survives that long because instead of a battery-draining LCD display, the Go opts for E Ink, the kind you've seen in a Kindle. And like an e-reader display, you can view it direct sunlight, a handy feature for a device that's designed for people who spend a decent amount of time outdoors.
The Go's also water-resistant, and automatically recognizes when users start swimming rather than walking or running (although who's to say if you start making butterfly motions on dry land). Even if it were just a simple step-tracker, though, it would be worth the $70 price tag just for the comfort of knowing you only had to plug it in once a year.
