This is a select Pain control system called Tens which delivers electrical pulses through the skin to the cutaneous and and afferent nerves with stimulant and has battery controlled device. No drugs or topical ointments. It has one opened and 4 additional unopened packets of four electrodes each. Total cost will be over $250.00 selling for $120.00 Works well. you have any questions and need any more info don't hesistate to contact.