Luna is the only smart ring with a personal AI coach. No more guessing about your health. Talk to Luna and learn more about your body. Receive recommendations to improve your health – hyper-personalized to your needs. Weighing only about 4 grams and made from materials including titanium, the Luna Ring offers a battery life of up to 6 days on a single charge. It measures subtle changes in your heart rate, skin temperature, and blood oxygen levels to provide you with a comprehensive analysis of your body's physiological state. It is waterproof up to 50 meters. Whether you're washing your hands or diving into the sea, the Luna Ring works flawlessly. The ring uses advanced algorithms developed in collaboration with Philips Biosensing to provide you with the most accurate information on health and well-being.