chair function：it has 4 kneading wheel on the neck,and 4 kneading wheel on the waist.and 4 vibration on the seat.the seat and the backrest can adjust by the controller,the armrest can lift 90 degrees.arms with tray.Fuction of the tub:at the bottom it has sole surfing. the lamp have 7 seven color,and change one by one.Also the foot cushion can lift up and down.there are 2 buttom of the hot&cold water.the back of the tub has a water inlet&out pipe.