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It may cause the switch to malfunction. 7. Some sounds may be heard coming from the massager while in use. This is due to the structure of the massager. This is a normal condition. 8. Make sure that there are no obstacles behind the chair when reclining it. The chair can be reclined to a maximum angle of 160°. If the back hits a wall or pillar, it may malfunction. Be sure to have ample space behind the chair. Recline chair slowly in order to avoid contact with an obstacle. 9. When excessive p