Creative Strap Design
The lightweight metal bezel is designed with a technological aesthetic. And the upgraded silicone strap is skin-friendly and breathable for a long time wearing.
![Haylou RS4 Black and grey smart watches](https://haylou.info/images/rs4-s3-02.jpg)
New Look Whenever You Want
The APP watch faces are constantly updated. Customize the watch face with images of your choice or even your picture.
![Haylou RS4 Various watch faces](https://haylou.info/images/rs4-s3-03.jpg)
Blood Oxygen Testing
Sleepiness and fatigue after high-intensity exercise or work is a sign of insufficient oxygen in the body. Raise your wrist to test your blood oxygen level and keep your health under control.
![Haylou RS4 Smart watch on a hand](https://haylou.info/images/rs4-s4-01.jpg)
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