posture pump® dual deluxe full spine (model 4100-d) posture pump 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)