I bought a nice #smartwatch NO.1 DT28. It's a very functional smart watch. Accurate heart rate measurement along with the ECG graph. Perfectly made. I recommend buying this store.
Online store: GearBest
DT28 Men Smart Watch IP68 Waterproof Payment ECG Heart Rate Monitor Fitness Tracker Smart Wristband Sale, Price & Reviews | Gearbest
26.09 USD
Online store: Banggood
[Free Gift]DT NO.1 DT28 1.54 Big Display Wristband ECG Monitor HR Blood Pressure Mobile Payment Smart Watch
38.99 USD