evofit Smart Ring - Brand: evofit - Model Name: Smart Ring - Size: Size 9 As a size reference: Worn by a male, 175cm tall, 85kg. Fits perfectly on the left ring finger, and could also be used on the index and middle fingers. - Accessories: Only what is shown in the photos - Color: Silver I used this smart ring for about 3 weeks as my first smart ring. I've purchased a more advanced one, so I'm selling this one. This is a used ring, so there are some scratches on the surface, but there are no issues with its use. If you, like me, want to try one out, how about it? Please check Amazon for detailed size information and functionality. The Smarthealth app can be used.