Activity Monitors features: Smart watch for Unisex 1.78 '' Full Touch screen, IP67 waterproof 24h Heart Rate Monitoring Bluetooth Call Message Reminder for iOS Android-Silver Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. IP67 Waterproof: With hard shell and durable strap, it is excellent at IP67 waterproof, with professional sports performance, it will not be afraid of wind and rain and will accompany you to challenge the outdoors. Bluetooth call function: Use high-fidelity waterproof waterproof speakers, Bluetooth hands-free call, high-definition original sound, whether sports or driving, press the phone to the watch when the phone calls, one-click response, free hands, and make communication more free. Screen design: 2.8mm narrow bezel, center-screen watch, no chin design, as high as 91.18% screen-to-body ratio, 320x385 HD resolution, size of 1.78 inch screen, larger than similar smart watches and very clear. Long-lasting battery life: With 200mAh power, deeply optimized system battery management, it can still provide 3 days of long-lasting battery life in the case of performance improvements complete, to completely get rid of battery anxiety. Analysis of professional exercise: During exercise, you can view your exercise time and exercise distance at any time, and you can also view the caliber during exercise, provide exercise progress, exercise speed and heart rate changes during exercise.