... frequency of 450 kHz, the electric field changes its polarity 8,000,000 times per second. Responding to the rapid ... treatment,no need of anaesthesia,no side effect,no scar.4.Effectiveness:Clinical studies confirm it could stimulate collagen regeneration, ... system Water cooling+wind cooling Display screen 8.4 inch colorful touch screen Cooling temperature -4°C to normal temperature Voltage 220V 50HZ ...