Feature: 1. REINVENTING HEALTHY LIVING: It's more than just a health monitoring device. It's also a proactive lifestyle. By recording and analyzing your health data, it can provide effective advice and guidance to motivate you to adopt a better lifestyle to stay healthy and energetic. 2. SLEEP MONITORING: During different stages of sleep, the body undergoes different metabolic processes for growth, repair, restoration and maintenance. It can help you understand the various sleep stages, sleep behaviors and body states. 3. FITNESS TRACKING: The smart ring makes it easy to record steps, distance, calories and pace, analyze map pathway tracking and detailed workout data to help you improve your performance and exceed your limits. 4. ALL DAY MONITORING: It utilizes energy saving technology to ensure it can work continuously for 5‑7 days without recharging. Made of polished stainless steel, it is lighter than a typical ring and is water and sweat resistant so you can wear it comfortably all day long. 5. SIMPLE AND ELEGANT DESIGN: This smart ring has a stylish and minimalist look. Both the appearance and hardware perform exceptionally well, and it is compatible with for iOS and for Android. Specification: Item Type: Smart Ring Material: Stainless Steel Ring Battery: Lithium Polymer Battery (Built In) 20mAh RAM Memory: 64KB FLASH Memory: 4Mb BT: BT5.3 Waterproof Rating: IP68 Working Time: 5-7 Days APP: For LuckRing (For Android, For IOS Store Download Or Cell Phone Scanning Manual QR Code Download) APP Main Functions: Steps, Kilometers, Calories, Exercise Data Recording, Sleep Health Monitoring, Sleep Tracking, Body Fatigue Evaluation, Multiple Exercise Modes. Package List: 1 x Smart Ring1 x USB Cable1 x Instruction Manual