{"product_id":"osaki-op-4d-master-massage-chair-1","title":"Osaki OP-4D Master Massage Chair","description":"\u003c!-- Osaki OP-4D Master Massage Chair — product description (plain layout) --\u003e\n\n\u003ch2\u003eOsaki OP-4D Master Massage Chair\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eThe first chair that massages over your shoulders.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eMost massage chairs stop at the top of your spine. The OP-4D Master goes further with ten individual airbags built into shoulder pads that rotate and press down over the tops of your shoulders, the way a person's hands would. An extra massage node sits on each side of the shoulder pad to mimic the pressure of thumbs. This is the feature that separates the Master from chairs that can only reach the back of the neck, and it is why the chair tells you to clip the magnetic pillow to the side before you begin: the pillow positions your shoulders correctly for that overhead compression.\u003c\/p\u003e\n\u003cp\u003eBehind the shoulder work is a 4D+ roller mechanism running on a laser-crafted steel SL-Track that follows the body from the neck and shoulders down to the hamstrings. The chair scans your body to find shoulder height and width, then uses its Health Pro program to read tension in the torso and adjust the massage to it. You control depth, strength and speed across the intensity range, choose from 16 automatic programs and 6 manual techniques, and recline into one-stage zero gravity. Space Saving Technology lets the chair sit 3 inches from the wall and still fully recline. Available in Taupe, Brown and Black.\u003c\/p\u003e\n\n\u003ch3\u003eConstruction\u003c\/h3\u003e\n\n\u003ch4\u003e1. Over-the-Shoulder Airbags\u003c\/h4\u003e\n\u003cp\u003eTen airbags housed in the shoulder pads inflate in sequence and rotate across the top of each shoulder, a motion most chairs cannot produce because their air cells only squeeze from the sides. A separate node on each pad adds a point of focused pressure. Attach the magnetic pillow to the chair before the program starts so your shoulders sit under the airbags rather than below them.\u003c\/p\u003e\n\n\u003ch4\u003e2. 4D+ Roller Mechanism\u003c\/h4\u003e\n\u003cp\u003eThe 4D+ mechanism adds forward-and-back roller depth to the usual up, down and side movement, and lets you set strength and speed independently. That fourth axis is what allows the chair to slow down and press harder on a single tight spot instead of running every muscle at one fixed pace, and it can spot-treat a section of the back rather than working the whole length.\u003c\/p\u003e\n\n\u003ch4\u003e3. Laser-Crafted Steel SL-Track\u003c\/h4\u003e\n\u003cp\u003eThe rollers ride an SL-Track cut from laser-crafted steel that curves from the neck and shoulders through the lower back and continues under the seat to the hamstrings. An S-shape alone follows the spine; the L-extension carries the rollers past the tailbone into the glutes and upper legs, areas a shorter S-track chair leaves untouched.\u003c\/p\u003e\n\n\u003ch4\u003e4. Health Pro Tension Detection\u003c\/h4\u003e\n\u003cp\u003eBefore a massage, an automatic body scan measures your shoulder height and width so the rollers line up with your frame. The Health Pro program then reads tension across the torso and tailors the session to it, which matters because the same program run on two different bodies otherwise lands in the wrong places.\u003c\/p\u003e\n\n\u003ch4\u003e5. Foot Rollers and Extending Calf Section\u003c\/h4\u003e\n\u003cp\u003eEach foot sits over three rollers set against reflexology ridges that target acupressure points from heel to toe, while the calf section combines vertical kneading rollers with airbag compression. The footrest extends up to 8 inches, so taller users get the rollers under the arch and the calves held in the airbags instead of dangling past the end.\u003c\/p\u003e\n\n\u003ch4\u003e6. Zero Gravity and Lumbar Heat\u003c\/h4\u003e\n\u003cp\u003eOne-stage zero gravity reclines you until your legs sit above your heart, a NASA-developed posture that takes load off the spine. Heating coils in the lumbar section and the feet add warmth in the 75–83°F range to loosen the lower back and feet. Space Saving Technology slides the seat forward as it reclines, so the chair needs only 3 inches of wall clearance.\u003c\/p\u003e\n\n\u003ch3\u003eBuyer's Guide\u003c\/h3\u003e\n\u003cp\u003eWhen comparing 4D massage chairs, start with how far the roller track actually reaches. Many chairs advertise an \"SL-Track\" but stop short of the glutes; the Master's track runs to the hamstrings, which is the difference between a back massage and a full posterior-chain massage. The second thing to check is the shoulders. Standard air cells press your shoulders from the sides. The Master's ten over-the-shoulder airbags press down from above, and that overhead motion is genuinely uncommon at any price.\u003c\/p\u003e\n\u003cp\u003eThe \"4D\" label is worth understanding before you pay for it. 2D rollers move up, down and across. 3D adds depth in and out. 4D adds programmable speed and rhythm to that depth, so the massage can pause and lean into a knot rather than running at one tempo. On the Master you set strength and speed yourself, which is what makes the spot-treatment and deep-tissue work usable rather than a fixed preset.\u003c\/p\u003e\n\u003cp\u003eFit matters more than buyers expect. The Master accommodates users up to 260 lb, and its footrest extends 8 inches for taller frames, but the seat width is 18 inches and the body scan calibrates to your shoulders, so it suits average to larger builds better than very petite ones. Measure your doorways too: the chair is 31.5 inches wide and ships in two boxes, the larger of which is over 55 inches long.\u003c\/p\u003e\n\u003cp\u003eFinally, weigh the extras against how you will actually use them. The wireless phone charging pad, USB port, Bluetooth surround-sound speakers, negative-ion generator, LED mood lighting, Alexa voice control and the Osaki Premium 4D+ Master app are real conveniences, but the massage itself is decided by the track, the 4D rollers and the shoulder airbags. Buy the Master for those three; treat the rest as reasons it is pleasant to sit in between sessions.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003ch4\u003eMassage System\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMechanism:\u003c\/strong\u003e 4D+ roller (adjustable depth, strength \u0026amp; speed)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrack:\u003c\/strong\u003e Laser-crafted steel SL-Track (neck to hamstrings)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder airbags:\u003c\/strong\u003e 10 over-the-shoulder airbags + 2 side nodes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAir cells:\u003c\/strong\u003e 46-airbag compression\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto programs:\u003c\/strong\u003e 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManual techniques:\u003c\/strong\u003e 6 (Kneading, Tapping I\/II, Shiatsu I\/II, Rolling)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntensity levels:\u003c\/strong\u003e 6–7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody scan:\u003c\/strong\u003e Automatic shoulder height \u0026amp; width detection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTension detection:\u003c\/strong\u003e Health Pro AI program\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFoot rollers:\u003c\/strong\u003e 3 rollers per foot with reflexology ridges\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFootrest extension:\u003c\/strong\u003e Automatic, up to 8\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eComfort \u0026amp; Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZero gravity:\u003c\/strong\u003e One-stage recline\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpace saving:\u003c\/strong\u003e 3\" from wall at full recline\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeat therapy:\u003c\/strong\u003e Lumbar \u0026amp; feet heating coils (approx. 75–83°F)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eController:\u003c\/strong\u003e Swivel-mount touchscreen + side control panel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoice control:\u003c\/strong\u003e Alexa devices or Alexa app\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApp:\u003c\/strong\u003e Osaki Premium 4D+ Master (iOS \u0026amp; Android)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAudio:\u003c\/strong\u003e Bluetooth surround-sound speakers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging:\u003c\/strong\u003e Wireless phone pad + USB port\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtras:\u003c\/strong\u003e Negative-ion generator, LED mood lighting, magnetic pillow\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColors:\u003c\/strong\u003e Taupe, Brown, Black\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eDimensions \u0026amp; Capacity\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUpright (W×L×H):\u003c\/strong\u003e 31.5\" × 68.0\" × 50.5\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReclined (W×L×H):\u003c\/strong\u003e 31.5\" × 72.0\" × 42.0\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder width:\u003c\/strong\u003e 24.5\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeat width:\u003c\/strong\u003e 18.0\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChair weight:\u003c\/strong\u003e 254.6 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax user weight:\u003c\/strong\u003e 260 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum door width:\u003c\/strong\u003e 31.5\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003ePower \u0026amp; Shipping\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e 110–120V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated frequency:\u003c\/strong\u003e 50 \/ 60 Hz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage — Box 1:\u003c\/strong\u003e 55.3\" × 33.9\" × 50.0\", 249.1 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage — Box 2:\u003c\/strong\u003e 23.4\" × 20.3\" × 22.4\", 49.6 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDelivery:\u003c\/strong\u003e Free curbside; white glove available at additional cost\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 5 years (3 years full service + 2 years parts)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat makes the OP-4D Master different from other 4D chairs?\u003c\/strong\u003e\u003cbr\u003e\nIts over-the-shoulder massage. Ten airbags built into the shoulder pads rotate and press down over the tops of the shoulders, with an extra node on each side for focused pressure. Most chairs only compress the shoulders from the sides, so this overhead motion is the Master's standout feature. It is backed by a 4D+ roller mechanism and a steel SL-Track that runs from the neck to the hamstrings.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow tall and heavy a user does it fit?\u003c\/strong\u003e\u003cbr\u003e\nThe chair supports users up to 260 lb. The footrest extends automatically up to 8 inches for taller frames, and an automatic body scan calibrates the rollers to your shoulder height and width. The seat width is 18 inches and the shoulder width is 24.5 inches, so it fits average to larger builds comfortably.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow much space does it need against the wall?\u003c\/strong\u003e\u003cbr\u003e\nThree inches. Space Saving Technology glides the seat forward as the chair reclines, so it can sit 3 inches from the wall and still reach a full recline. Upright it measures 31.5\" × 68.0\" × 50.5\"; reclined it extends to 72 inches long.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I control it with my voice or phone?\u003c\/strong\u003e\u003cbr\u003e\nYes. Voice control works through Alexa devices or the Alexa app using the commands listed in the manual. The Osaki Premium 4D+ Master app, available for iOS and Android, gives you the full remote feature set on your phone. The chair also includes a swivel-mount touchscreen controller and a side control panel.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat warranty comes with the chair?\u003c\/strong\u003e\u003cbr\u003e\nThe OP-4D Master is covered by a 5-year limited warranty: 3 years of full service plus an additional 2 years on parts. Full service covers parts and labor during the first three years; the final two years cover parts only.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow is it delivered and set up?\u003c\/strong\u003e\u003cbr\u003e\nThe chair ships free curbside in two boxes; the larger box is over 55 inches long and weighs about 249 lb, so plan for help moving it inside. White glove delivery, which brings the chair into your room and sets it up, is available for an additional cost. Confirm your doorways clear the 31.5-inch minimum width before delivery.\u003c\/p\u003e","brand":"Osaki","offers":[{"title":"Black","offer_id":59516986818846,"sku":"OSAKI-MASTER-BLK","price":7999.0,"currency_code":"USD","in_stock":true},{"title":"Brown","offer_id":59516986851614,"sku":"OSAKI-MASTER-BRN","price":7999.0,"currency_code":"USD","in_stock":true},{"title":"Taupe","offer_id":59516986884382,"sku":"OSAKI-MASTER-TPE","price":7999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/9625\/6030\/files\/op-4d-master-black-388657_700x700_1d50bdc2-8c55-43b1-a762-723d876214f9.jpg?v=1782492885","url":"https:\/\/massagechairwarehouse.com\/products\/osaki-op-4d-master-massage-chair-1","provider":"Massage Chair Warehouse","version":"1.0","type":"link"}