This Environ Electro-Sonic DF Mobile Skincare Device is a hand held home care device that blends two technologies that result in making a remarkable and long lasting difference to your skin. Low frequency sonophoresis, (sound waves) and pulsed iontophoresis, (electrical current) when worked together, along with your chosen Environ Serum ensures that you are getting the maximum results possible for your Environ Skincare Routine.