Turn Any Watch Into a Smartwatch With the Chronos Disc

People who like watches tend to really like their watches. That means most aren't giving up their hard-won collections in favor of something digital. Smartwatches aren't just up for debate—they're not even part of the conversation. The Chronos device is one of the best attempts yet at addressing this gap.

Chronos is a small metal disc that turns any watch into a smartwatch. It's just 33 mm across and 2.5 mm thick and weighs next to nothing. It's waterproof, and a microsuction surface on the back lets it adhere to the back of a watch, situating it between the mechanism and your wrist. Inside the Chronos is an array of sensors, a few LEDs, a vibration engine, and a battery, letting it add sort of ad-hoc smartwatch functionality to watches you already wear.