There are fitness trackers and there are smartwatches, but there's only a small number of devices that attempt to be both. The Garmin Vivosmart is one such exception. It's a $170 band that does ...

The Index sleep monitor has two parts: the hardware, which is a flat little nugget of plastic and electronics, and the fabric band. The band is wide, soft, and stretchy. It’s about 2.5 inches wide, ...