Sorry for the confusion. The different styles are working modes, not different machine appearances. For the RF head, the main difference is the red-light flashing pattern and heating rhythm: Style A: red light flashes continuously Style B: red light flashes about every 1 second Style C: red light flashes about every 2 seconds For the cavitation head, the styles also have different vibration patterns. You can choose the style based on your comfort and treatment preference.