6 PCS Smart Temperature Ring, Size: 9 1. Material: stainless steel 2. Single diameter: No. 6 is about 16.5 mm, No. 7 is about 17.3 mm, No. 8 is about 18.2 mm, No. 9 is about 18.9 mm, No. 10 is about 19.8 mm, No. 11 is about 20.7 mm, No. 12 is about 21.3 mm, No. 13 is about 22.1mm 3. Single circumference: No. 6 is about 5.3 cm, No. 7 is about 5.6 cm, No. 8 is about 5.9 cm, No. 9 is about 6.2 cm, No. 10 is about 6.5 cm, No. 11 is about 6.8 cm, No. 12 is about 7.1 cm, No. 13 is about 7.1 cm About 7.5 cm 4. Weight: about 7 gramspiece 5. Applicable gender: both male and female 6. Function: body temperature sensor display 7. Features: unique shape, beautiful and exquisite, intelligent temperature sensing, versatile personality, solid material, not easy to wear, no color, not easy to scratch, comfortable to wear 8. This product adopts the principle of thermal temperature sensing. Wearing for 10-20 seconds, the temperature will be displayed. 9. Built-in thermal chip, no need for other external assistance (such as charging, battery, electronics) 10. It can be used for a long time, and the temperature display is 24-39 degrees, which changes according to body temperature 11. The temperature accuracy has an error of 0.5 degrees. The nature of the jewelry is not medical, and there is a slight error