The working principle of this product:
Its main working principle is acupoint massage.This acupoint is called Hukou acupoint( LI4 acupressure point) in China. It is a very important acupoint for the body. Daily massage on Hukou acupoint can enhance body resistance, effectively treat headache, neuralgia, deafness, tinnitus, toothache, insomnia and whelk.

scale as required :)

Good print