Amazfit Global on Instagram: “With the self-developed BioTracker™ 4.0 PPG sensor, the #Amazfit #GTS4 enables even more accurate 24/7 monitoring of heart rate…”
Amazon.com: Amazfit GTS Fitness Smartwatch with Heart Rate Monitor, 14-Day Battery Life, Music Control, 1.65" Display, Sleep and Swim Tracking, GPS, Water Resistant, Smart Notifications, Obsidian Black : Electronics
Amazfit GTS 4
SMARTWATCH AMAZFIT GTS 2 W19690V5N DESERT GOLD/3GB/WI-FI/5 ATM/MIC Y PARL/OXYGENBEATS/BIOTRACKER/1.6
Amazfit Gts 4 Smartwatch - Infinite Black : Target