US Patent 7178178 Inductive peripheral

A peripheral device for a spa makes use of inductance for power and/or control. In an embodiment, a peripheral device includes a magnetic field source positioned in a region on an externally facing side of a spa shell and configured to generate a first magnetic field. The peripheral device includes a peripheral module, such as a light or other feature. The module includes an inductor configured to generate a second magnetic field based on the first magnetic field, a converter configured to convert the second magnetic field into a current, and a peripheral feature configured to be powered by the current.