AK12 color screen smart bracelet heart rate monitoringfeature: 1. 1. 14 inch HD display. 2, IP68 waterproof rating (wearable watch for a short time swimming). 3, three special belts can be replaced (silicone, leather, Milan steel). 4. Accurately calculate your heart rate (you can pay attention to your physical and mental health throughout the day). 5, female physiological cycle monitoring (at any time concerned about women's health). 6, compatible with 99% of mobile phones on the market. 7, lightweight,