The Bio-Pulse 9000 bed, has 2 pulsing magnetic coils in the small size and four in the large size. They are mounted on soft foam and housed in a handsome black watch plaid fabric. The pulsing magnetic field easily penetrates into sore joints and muscles, providing relief of painful conditions. The rechargeable power control unit provides 30 minutes of therapy and then shuts off automatically. Ask us about rental options.