Feature:1. [Color Display Screen] You can easily view the current time and steps without frequently taking out your phone or watch, making time management more convenient. Touch key to switch on off and function interface.2. [Multiple Sport Modes] Supports multiple sport modes such as mountaineering, cycling, running, real time monitoring of exercise duration, steps, and other important data.3. [Phone APP Connection] The smart ring can be associated with mobile APP, allowing you to more accurately check your own data situation.4. [IP68 Rating] The ring can work normally whether washing hands, showering, swimming, or shallow water diving, without worrying about water entering and affecting functionality.5. [Smart Control] Easily control functions like phone camera and video browsing with simple gestures. Simply wave your finger to slide the video, can also control the camera.6. [Stainless Steel Material] Made from premium stainless steel material, sturdy and anti corrosive, able to maintain a smoothly and undamaged finish even in humid or sweaty environments.Specification:Item Type: Color Screen Smart RingMaterial: Stainless SteelRing Battery Capacity: 18mAh, Lithium Cell (Built in)Charging Case Battery Type: Lithium Cell (Built in)Charging Case Battery Capacity: 300mAhSize Inner Diameter 8 17.7mm / 0.7in 9 18.9mm / 0.74in 10 20.4mm / 0.8in 11 21mm / 0.83in 12 21.6mm / 0.85in.Package List:1 x Color Screen Smart Ring1 x Charging Case1 x Charging Case Power Cord1 x Instruction ManualNote:Manual measurement, 0.2mm size error.