Compatible with titanium and ceramic Oura Ring 4 styles Delivers up to five charges for your Oura Ring 4, keeping it powered for weeks With seamless charging, every heartbeat, movement, and moment of sleep is tracked, giving you a complete view of your health LED light indicates how charged your Oura Ring is The match-box sized case is made of high-grade, durable recycled aluminum and is splash-resistant Compact and portable design fits easily into any pocket, purse, or bag for on-the-go convenience Charging case is size-specific, so make sure to get one that matches your size USB-C cable is not included in the box Made by Oura. Unauthorized chargers may overheat and permanently damage the ring battery