Do these work the same as the professional/medical ones? A friend of mine had one during a study, and she claimed it worked by electrostimulation (small electri

Do these work the same as the professional/medical ones? A friend of mine had one during a study, and she claimed it worked by electrostimulation (small electric shocks), not ultrasonic waves? She wanted to buy one of those devices because they really helped her but the cost was upwards of 1500€, this would probably be within range for her, assuming it works the same way?