First Look: Withings Pulse O2
Billed as Withing's new product, and the sequel to last summer's Pulse Activity Tracker, Pulse O2 ($120) is actually a simple update with some new software. The sensor itself is exactly the same as before, but it ships with updated firmware that can detect blood oxygen levels, which is especially important for mountain climbers, those training in high altitudes, and people with breathing problems. This firmware is available for existing Pulses. There's also a silicone band included in the package now, so the device can be worn as a watch.