This Oura Ring Gen 3 in Gold, size 7, comes with its original charger and a WOLF travel jewelry box. It is compatible with iOS and Android operating systems and has a mobile app. This activity tracker is suitable for indoor/outdoor use, has a titanium body, and provides heart rate and distance measurement. Its battery life can last a full day or even up to 2 days! and it includes features such as temperature monitoring, water resistance, and sleep tracking. This is preowned comes with original charger! And a genuine WOLF travel jewelry case! I utilized this ring for 1 year! So it has signs of wear (the gold isn’t perfect and has minor scratches- but works perfectly!!! I LOVED this ring!!! Size 7 The Oura Ring Gen 3 also includes infrared and SpO2 sensors, making it ideal for gym and training activities, swimming, and running and jogging. This unisex adult activity tracker is a perfect choice for those who want to keep track of their fitness and daily activities. DAYTIME HEART RATE The Oura 3 sports a new set of green LED sensors for tracking your heart rate in real-time and throughout the day. Do note that the predecessor can only track heart rate variability while you’re sleeping. With the new daytime heart rate tracking, the ring has therefore a better grasp of your routines, meals, stress levels, and environment. Oura can better understand how a cup of coffee affects your heart rate. WORKOUT HEART RATE The green LED sensors Sleep sensor