Feature: 1. EXQUISITE AND ELEGANT: Made of premium aluminum alloy and ceramics, this ring is sturdy, durable, and beautiful and elegant. 2. LIGHTWEIGHT: With a lightweight design and ultra light body, there is no sense of wearing the ring, and the lightweight wearing experience is so light that you may forget its existence. 3. MULTI FUNCTIONAL: The smart ring has multiple functions to monitor your heart rate, sleep, and take notes at any time; BT connection is more stable; Check your sleep time and sleep status to tell you how good your sleep quality is. 4. FINE WORKMANSHIP: Well crafted in smoothly and fine appearance, this ring has a delicate surface and is comfortable wearing. 5. IDEAL GIFT: This ring is a meaningful gift suitable for any scene or holiday, such as birthday, anniversary, Thanksgiving, Christmas, Hanukkah, or Valentine's Day. Specification: Item Type: Smart Ring Material: Aluminum Alloy, Ceramic, Electronic Components Battery Type: Lithium battery (shipped with built in battery) Battery Capacity: 18mah Battery Life: 3 to 5 days Charging Duration: 45 minutes. Package List: 1 x Ring 1 x Charging Cable 1 x Manual Note: Please make close contact between the sensor (inside the ring) and the skin of your fingers to ensure accurate data.