Medline?s state-of-the-art Supra DPS mattress is our most feature-driven mattress replacement system. Functions include alternating pressure, low air-loss, static float, auto firm and seat inflation Cell-on-cell design prevents bottoming out during a power outage Digital pump with choice of four alternating pressure cycle times Upgraded low-friction, anti-shear stretch cover Low- pressure alarm with audio and visual indicators 400-lb. weight capacity Also available with 4" raised air bolsters to help reduce the risk of patient falls and entrapment