Our products are temperature sensitive rings that change with temperature. It is worn on the finger for 20-30 seconds, and different black numbers can appear in the middle of the ring; There is a process of heating and cooling, and the temperature is also felt when the environment changes; The temperature is displayed when the temperature of the hand (Finger) reaches a certain temperature; (When the temperature is not shown, you can use the other finger to close the finger for a moment) When the temperature is unstable, some temperature will be displayed.
It is recommended to wear it for a while. If it takes a long time, it will only light up the total hand temperature; if it displays a lot of color, green is right.









