Frederique Constant is giving watch aficionados an elegant way to seamlessly add smartwatch functionality to their analog timepiece. The E-Strap is a small, unassuming device that is integrated into the buckle and is able to track activity, sleep, and has sleep cycle alarms, "get-active" alerts, and intelligent coaching. This all works with the company's mobile app that gives you shows you all your data and is compatible with both iOS and Android platforms. 

E-Strap will be available this May and comes in 20 and 22mm strap sizes.

$229-$249, frederiqueconstant.com