. Feature: 1. Energy-saving technology ensures continuous monitoring of do 7 days on a single charge, without any interruptions. 2. The included app, compatible with both Android and iOS, allows you to conveniently view your data at any time, so you always have nad your health. 3. Its sensors remain fully functional, constantly monitoring your health data. 5. The perfect gift choice for occasions such as Christmas, Thanksgiving, graduation ceremony, or housewarming. . Material: ceramic Black color Ring Battery Type: Lithium Battery, 18mAh (Supplied with Built-in Battery) Ring battery life: about 7 days Ring charging time: 60 minutes APPLICATION: JYouPro . 1 x User Manual 1 x Charging Cable .