The Med-Aire Alternating Pressure Pump and Pad System provides alternating pressure and is designed to be used in the prevention, treatment and management of pressure ulcers. The bubble pad provides superior therapeutic treatment by alternating which of 130 individual bubble cells are inflated or deflated every 5 minutes, never placing too much pressure on any effected area. Variable pressure setting on pump allows for individual comfort. The quiet pump has built in brackets for mounting easily to a bed. 78"W x 36"W x 2 1/2"H. This item ships from a separate warehouse and will arrive in a separate package.