The Osaki OS-4000XT massage chair with LED light control features an L-Track system with 2 step zero gravity, 6 auto programs, and an Ache Sensor. The Ache Sensor detects the aching point of user's body once the arms are inserted into the sensor naturally in the armrest. It has an Ache Sensor which detects the aching point of the user's body by putting their hands into the sensor naturally in the armrest. The massage will be focused on the collected aching points accordingly. Osaki OS-4000XT L-Track Massage Chair with Zero Gravity, Space Saving, Brown
