Featuring acrisper display, more powerful heart rate monitor and now fully compatible with Bluetooth Smart Heart Rate sensors the new Fenix 5 series is Garmin's most advanced and inclusive sports watch to date. Lightweight and compact the Fenix 5S is the sleeker more refined model from the new Fenix 5 series, designed to be more but not weigh more. It has the smallest screen size at 42mm and has a lower profile design ideal for smaller wrists or active users concerned with bulk.The Elevate wrist based heart rate monitor has also been imporved and is now made from streamlined stainless steal for comfortable all day recording. The Garmin 5S regualr glass does not connect with wifi but can still connect with Garmin Connect over bluetooth for deep dive analysis post excercise.