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(Electrically adjustable),the armrest can lift 90 degrees.arms with tray.Fuction of the tub: pipeless shower，at the bottom it has sole surfing..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.