Costway-4D Massage Chair, Full Body SL Track Zero Gravity Massage Recliner w/ Airbags, Heater, Calves & Foot Rollers, Stretch, Voice Control, Auto Shoulder Scan, Wireless Charging Station, Bluetooth Speaker, Installation-Free Design JL10037WLUpgraded 4D Massage & SL Track: The 4D manipulator with 2 independent airbags can be adjusted up and down, left and right, forward and back, providing a more precise and comfortable massage. The 51. 5 131 cm long SL track follows the contours of the human body and ensures a larger massage area. It also has the auto shoulder scan function for a personalized massage experience. Full Body Massage with Heater, Calves & Foot Rollers: There are 42 airbags