This Med-Aire Alternating Low Air Loss Pressure Mattress system provides alternating pressure and is designed to be used in the prevention, treatment and management of Pressure Ulcers. The "WHISPER QUIET" pump produces consistent air flow.Mattress can operate in an alternating or static pressure mode. Special vibration isolating features insure that the patient rests easily without feeling the pumps vibrating action. LED and audible alarm provide critical performance data and alert caregiver when pressure falls below 10mmHg (inner mattress pressure). Easy to replace individual bladders.Mattress has 20 air bladders, nine (9) with laser holes to achieve low air loss function, to increase patient comfort, keep the patient cool and speed recovery.Quick fill adapter and carry bag standard.Spring lined air tubes prevent kinks and disruption of air flow. CPR valves provide fast (20-Second) deflation. Weight Capacity: 350 lbs. 8" high air cells are constructed with Nylon/50% PVC for durability. Warranty 12 Months Limited.