A novel salon chair having a novel movable footrest assembly with a sliding or pivoting footrest which replaces a conventional rigid tubular one-piece footrest typical of salon chairs. The application device has an anti-friction roller, which is supported on a pivotable lever of the application device. The bearing system is characterized in that a ball seat is provided and contains two axially interspaced bearing shells each of which has an opening, whereby the ball protrudes at least partially into the openings. The information on the demodulation capability of a BTS is output to G parameter control section 112 and G parameter control section 112 determines an optimal gain factor.