Cuifati Smart Ring - IP68 Waterproof 18 Milliamp Hours

6. Perfect: the intelligent health ring is comfortable and barely noticeable when worn. This makes it an ideal with which your loved ones feel special and grateful. It is also perfect for weddings, graduation celebrations and housewarming parties. Specification: Item type: smart health ring. Material: ceramic, stainless steel. Colour: blue. Ring battery type: lithium battery. Ring battery capacity: 18 mAh (shipped with built-in battery). Ring battery life: approx. 7 days Ring charging time: 60 minutes. Charging case battery type: lithium battery. Charging case battery capacity: 400 mAh (shipped with built-in battery). App: for JYouPro. Package list: 1 x smart ring. 1 x charging case. 1 x user manual (English language not guaranteed).