Alternating pressure relief pad system designed to prevent and treat Stage I and II pressure sores,Pump alternately inflates and deflates air cells in 2.5" mattress pad to create different patient support points,Deluxe bubble pad includes end flaps to help secure pad on mattress,Quiet pump alternately inflates and deflates 13 individual bubble air cells,4 LPM (liters per minute) pump produces consistent air flow and pressure over a 5 minute cycle time,Variable pressure setting on pump allows for individualized comfort increasing patient compliance,Bubble pad design provides superior therapeutic treatment,Pump has built in bracket for mounting pump easily to bed,Pad is made of long lasting durable heavy gauge premium vinyl