Last week, Withings commercially launched Pulse, an activity tracker, which the company first announced at CES in January. The tracker is available for pre-order at $99.95 from the company's website.

Withings has launched the next version of its Pulse activity tracker, now called Pulse O2. The new device allows users to measure their blood oxygen levels, which help users understand the efficiency ...

The $69 device is the company's least expensive and most versatile tracker. Is that the world's smallest watch or the biggest button? Hard to tell from the size and description without actual metrics.