POSTURE PUMP Dual Deluxe Full Spine (Model 4100-D) combines neck & upper back Model 1400-D with Elliptical Back Rocker Model 2000. New Comfort Visor gently molds to the shape of the forehead (no chin or jaw contact). Does not hyper-extend the neck. Dual EED air cells* decompress & hydrate cervical discs, while decompressing & shaping the cervical (neck) curve at moderate pressure levels for comfortable, corrective deep relief. Simultaneously, two opposing air cells in the lower back unit get to the cause of pain & stiffness fast. Comfort pad attaches both neck & back units into one. Conveniently folds & locks together for easy travel. With easy to use hand pumps & uniquely angled air cells, expansion & contraction (up & down motion) of these air cells creates alternating hydration of the spinal discs & joints. When the air cells are left inflated for longer periods of time (15-20 min.), postural shaping & decompression occurs. *Expanding Ellipsoidal Decompression (EED)