With the Centurion 4PH you have full control over treatment settings. The 4PH System has a full line generator that offers the user the choice of ten (10) different frequencies and nine (9) different intensity settings. Treatment time can be varied from one to ninety-nine (1-99) minutes. The Hoof Pad is an accessory designed to operate with either of the powered machines - 4PH or 9PH. As every horseman knows that problems often start from the feet, the Centurion Hoof Pad has been widely used on indications such as: Abscess, concussion problems, bruised feet, swelling, etc.