For more colors, please enter the LZUEFK store to choose LZUEFK Smart Ring Q: How to measure and choose the appropriate ring size? A: First find an inelastic thin wire and wrap it around the finger where you want to wear the ring. Use a pen to mark the meeting point, then straighten the wire. Use a ruler to measure the length between two points of the thin wire and then choose to purchase according to the size chart. Q: Does this smart ring have an on/off key? A: This smart ring does not have an on/off button. After connecting to Bluetooth, it will automatically monitor your exercise and heart rate, and then synchronize the data to the APP. Other Measurement Methods

?A Gift of Health and Fashion?Surprise someone special with the LZUEFK smart ring, a gift that combines health monitoring technology with a stylish design. This thoughtful present is perfect for those who value their health and desire to stay fashionable. Give them the gift of wellness and style with this exceptional smart ring. ?Intuitive Remote Control Photography?Capture special moments with ease using the LZUEFK smart ring's remote control photography feature. Simply open the ECTRI app, select the remote control photography option, and start taking photos with a simple hand gesture. This innovative feature unlocks new possibilities for selfies and group shots, making it a fun and convenient addition to your daily wear. ?Lightweight and Comfortable?The LZUEFK smart ring is designed with comfort in mind, featuring a lightweight and sleek titanium alloy construction. Its comfortable fit ensures that you can wear it all day without any discomfort, allowing you to focus on your daily activities without any distractions. ?Fitness Tracker for Active Lifestyles?The LZUEFK fitness tracker ring is perfect for active individuals who want to stay fit and informed. Whether you're a professional athlete or just enjoy an active lifestyle, the smart ring accurately tracks your daily activities, steps, calories, distance, etc. Providing real-time data to help you achieve your fitness goals. ?Health Guard All Night?The smart ring health tracker can automatically monitor heart rate throughout the day. You can also open our ECTRI APP to manually measure heart rate, body temperature and blood oxygen saturation. In addition, it also has a sleep monitoring function, which can automatically track your sleep data from 9:30 pm to 12:00 noon the next day, and analyze your sleep quality and give you suggestions on the APP, allowing you to intuitively see your sleep situation.