Frederique Constant Automatic with E-Strap FC-303LGR5B4

$1,095.00 $711.75
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Frederique Constant Automatic with E-Strap FC-303LGR5B4


Built by the watch industry experts that created the Horological Smartwatch, Frederique Constant’s E-Strap is a logical next step to add smart functionality to existing watches. The ultra-small buckle extension can hardly be seen, as it is thin and covered by the leather strap. The Frederique Constant E-Strap is built on the full Horological Smartwatch Platform and its sophisticated functionality. The same MMT-365 App that accompany Horological Smartwatches is available to Frederique Constant E-Strap customers. Frederique Constant E-Straps track ACTIVITY with GET ACTIVE ALERTS as well as MONITOR SLEEP with SMART SLEEP ALARMS.


The health tracking features of the E-Strap are powered by a small yet powerful module hidden in the buckle, based on an ultra-low power processor. It can work seamlessly up to 7 days. It is possible to synchronize your health data with your smartphone or tablet via Bluetooth Smart. The E-Strap can be easily recharged thanks to the small provided USB charger, where the buckle can be placed on.


Unlike common silicon fitness bands, the E-Strap has a unique horological finish that preserves the authentic look of your favorite analog timepiece. The Frederique Constant E-Strap is an advanced piece of technology but it is also an elegant buckle and strap crafted under demanding watchmaking codes. When worn, the buckle merges seamlessly with the strap and becomes an extension of the watch. The E-Strap buckle is available in stainless steel, rose gold-plated and yellow gold-plated steel.



On the iOS and Android MMT-365 apps, simple and easy-to-understand graphics highlight how much one has moved and slept during the day, week, or month.

This data will assist users to better understand themselves, and along with appropriate goals setting and intelligent coaching, will improve their well-being. A better sleep pattern and a more active lifestyle are widely recognized as simple, but effective, positive behavioural changes.

The patented sensor-fusion engine tracks activity and sleep patterns with high accuracy. Activity and sleep information is presented in the MMT-365 companion application. The E-Strap will synchronize data automatically with applications on Apple and Android smartphones.



The E-Strap’s battery lasts for a week, offering its wearer a carefree usage for his everyday life. Its light and compact charger also makes it the perfect companion when travelling.



This function will be your best ally for a healthier lifestyle! It will record the number of steps you’ve taken, measure the distance you’ve travelled and the numbers of calories you’ve burnt throughout the day, week and month. We offer you the perfect solution to become healthier easily and quickly.



Although one spends a third of their lifetime sleeping, people are rarely aware of their sleep patterns and of the various ways to improve them. The E-Strap provides a comprehensive summary of its user’s daily sleep progress.