The Sanyo DR7700 Massage Chair combines 4 Full-Body Sensor automatic courses with the rejuvenating benefits of a Zero Gravity recline. The Sanyo DR 7700's Zero Gravity position properly aligns your spine in an optimal resting posture so that physical stress is reduced & circulation is enhanced. You place your hand onto the chair's mouse-shaped stiffness detection sensor which uses Galvanic Skin Response to identify your areas of tension & stiffness. This is the same technology used in a polygraph & this technology provides a customized 15-minute full body massage, focusing on the identified areas. You can also target problem areas with your choice of techniques while airbags in the back & seat provide added therapy. Then, using the Sanyo DR7700's integrated cosole, select one of the 4 Full-Body Sensor Automatic Courses, Stiffness, recovery, Relax or Fine & simply by placing your hand onto the chair's mouse-shaped stiffness detection sensor, Galvanic Skin Response (the same technology used in a polygraph) identifies your areas of tension & stiffness, & a customized 15 minute full body massage begins, focusing on the identified areas. You can also target problem areas with your choice of techniques, while airbags in the back & seat provide added therapy. Sliding footrest extends nearly 5" for taller users.