The Single Musical Waterbed is a means for vibroacoustic therapy meant for children to teens to rest on. The warmth of the waterbed encourages relaxation of tense muscles and freedom to move. The vibroacoustic feature stimulates muscles and joints and provides much needed sensory input to enhance body awareness and independence. The hoist accessible base is fitted with two resonators that plug in like a single speaker to a stereo. Stereo included. Covered in phthalate-free vinyl for easy cleaning and disinfecting. Must use the correct stereo (50 Watt Continuous) in order to prevent any failures. The warranty is also void if the incorrect stereo is used. Made in USA.