1、COMPATIBLE: Fit for iOS and for Android, integrating over 40 apps. Wireless bracelets and Bluetooth watches have enough sensors, it's more important to know the data than to access it through wearable devices. 2、HEALTH TRACKING: Track your health with advanced sensors that tell you when you're sick and sometimes even before symptoms appear, analysing key body signals such as temperature trends and sleep quality. 3、EASY TO WEAR: Health rings are all made of stainless steel, with polished ceramic shells for durability and smoothing interiors made of medical grade stainless steel for maximum comfort. 4、WATERPROOF: The rings are also water and sweat resistant with an IP68 rating. From workouts to nights out, it will be monitoring your health in a comfortable and accurate way. 5、SLEEP FRIENDLY: Whether you're looking for a sleep ring or a fitness ring, the Fitness Ring is made for you, allowing you to discreetly track your sleep, activity, recovery and stress release. 6、TIMELESS GIFT: Allows you to make a personalised statement with its sophisticated design. Surprise your loved ones with a gift that embodies health and elegance, enhancing their daily experience and promoting a healthier future. Item Type: Smart ring Material: Aluminium alloy, stainless steel Battery Type: Polymer battery (built in) Battery Capacity: 17mAh CN10 Size Inner Diameter:Approx. 19.8mm / 0.8in Circumference:Approx. 62.1mm / 2.4in Thickness:Approx. 2.77mm / 0.1in Waterproof rating: IP68 APP: QRing (for Android/ for IOS shop download or scan the QR of the manual to download) Function: body temperature detection/remote control photo/multiple exercise modes/sleep monitoring (sleep time, sleep quality),/synchronise data to APP and other functions. 1 x Smart Ring 1 x Instruction Manual 1 x Charger