SM-PC Jetting-alternately Air Mattress is composed of regulator (with pump), pipes and pad. With the aid of electromagnetic vibration, the regulator works in high efficiency, low consumption and noiselessness, and supplies air alternately every 5 minutes. The pad is made of textile covered with nylon and rubber, featuring strong, portable and easy to clean. Two separate groups of tubular air chambers in pad are linked with the air pipes in regulator. They form meek wave motion with the alternating air feeding. The venting holes in the surface of air chambers blow off fresh air equally. Together with wave motion of pad, the mattress provides perfect effect on prevention and cure of bedsore.