Electronic products such as Wenquxing generally have a reset button, which is to restore the factory default value. This button is very small, just a small hole. Generally, you need to use a toothpick and other needles to order. See if there is one on the back. If not, try to open the battery box, take out the battery and see if there is a reset button. There is usually one. Check it carefully if you can't find it.

Then there should be a solution is to go to their website and find out the machine description of the corresponding model.