Misfit Flash

A gadget that never requires charging might sound like a pipe dream, but if it is, the Misfit Flash is that dream come true. Powered by a coin cell battery that lasts up to six months, this sleek tracker uses a 3-axis accelerometer to monitor your movement and sleep, measuring steps, calories burned, distance, sleep quality, and duration. It transfers all this data to your phone via Bluetooth, providing you with updates via a halo of lights on the front that show your progress toward your goal while also telling the time. It's also waterproof, wearable in several different ways, and, oh yeah, it's less than half what most fitness trackers cost.