Balance apparatus for physical biological electricity Balances your physical biological electricity and helps to restore health⚫ Irregularity of biological electric potential can cause hypertension. This apparatus is especially designed for people facing problems of high blood pressure and hypertensive headache. It is based on theories of bio-medical engineering. Biological electric potential is proportional to blood pressure. Use it like a comb for 1-2 times / ⚫ for 3-5 min / day.