Activity Monitors features: Chronus Smart Watch, 1.3 Inch Round Colorful Display, Bluetooth Call, Local Music, Message Reminder, Multi-Dial, Multiple Sports Modes, IP67 Waterproof, Female Menstrual Cycle(black) Color: we send based on the color or size of the main image of the product page. Quantitywe send based on quantity on title, if there is no quantity in the title, we send based on description. Music Storage and Playback: This watch supports offline music playback and can store about 200 songs locally. It can also be used with your bluetooth headset, or you can save files for proximity. Can't have any songs that you like while exercising. Information synchronization: cellphone and watch information synchronized, built-in large text, easy to read, easy to read, no need to check the phone. COOL THEED counting dials can be changed to will: a variety of cool theme dials and functional UI interfaces that WILL SWITCH on, meet diversified aesthetic themed personalities and fashion, retina level HD GROD screen, UL interface is clear and alive. Female Menstrual Cycle Management: Intelligently predict women's menstrual time, safe period, menstrual period and ovulation period, carefully record your menstrual cycle and provide reminders. Sleep monitoring: Real-time record of your sleep duration and sleep quality, give a reasonable sleep index, help you improve sleep quality.