The drawings From the FCC.

it seems more Fit 2 in size/ratio than Simbandlike?

http://www.techradar.com/reviews/wearables/samsung-gear-fit-2-1322606/review/3

FIT 2

Compatibility: Phones running Android 4.4+ or iOS 9

Display: 1.5-inch Touch Curved AMOLED

CPU: Dual-core 1GHz

Storage: 4GB

Battery life: 200mAh - 3 to 4 days

IP rating: IP68

How long does the current Fit 2 battery last?

supposedly...The fitness tracker is backed by a 200mAh battery which can last for up to four days on a single charge.

SIMBAND PIC

Notice the Simband had a LOT  os sensors where?

In the band...the FCC device looses many of them?

https://www.simband.io/documentation/simband-documentation/