Vibrotactile Subsonic Chair Pad - Fits comfortably in almost any chair and delivers the kind of vibration that is normally only available with much larger and more powerful transducers. Its patented design is based on a science that uses special type of material that limits impedance loss and provides the fullness of the signal directly into the body instead of feeling like it's vibrating on the outside. Rated from 5 to 128 Hz. it provides the full range of tactile vibrations and has superior durability insuring years of service. Straps into a chair and hooks up to any music or sound source. Comes with Pad, Amplifier, Cables and Manual. This is the perfect way to become involved with vibrational therapy without having to break the bank or sacrifice quality of experience.