HighlightsSit or Lie Comfortably in a Perfect Angle - It takes less time to find the most comfortable Angle you prefer, benefiting from the adjustable backrest, which can be adjusted within the range of 90° to 180° You can either sit bolt straight to keep a correct posture or lay there just for a relaxingErgonomic Design with Massage Cushion - When connected with a power supply, the lumbar cushion is capable of providing a comfortable massaging experience to alleviate your waist muscle fatigue.