Osaki OS-4000 Zero Gravity Massage Chair Brown Black Recliner STrack OS4000 br br Osaki OS-4000 Zero Gravity Massage Chair Brown Black Recliner STrack OS4000 br Zero gravity design br Designed with a set of S-track movable intelligent massage robot special focus on the neck shoulder and lumbar massage according to body curve br Automatically detect the whole body curve as well as make micro adjustments which brings more humanistic and scientific massage enjoyment br Designed with six unique auto-programs Healthcare Relax Therapy Smart Circulation and Demo br Automatic massage for the upper body shoulder neck back and lumbar the low body buttock thigh calves and feet