This unit was purchased at the beginning of September and was used less then a week. $3000.00 new, selling for $1700.00 This mattress is used for the maintenance of skin health; the prevention and treatment of stage I-IV pressure ulcers. This micro low air loss mattress system utilizes 18 8" combined air cells (4.5" therapy + 3.5" static air) to ensure support even in the event a power loss. The static air cell eliminates the need for a foam base, which means the whole surface can be easily disinfected. The Salute RDX pump powers the advanced 3-1 alternation, which provides active pressure relief: for every three cells, one cell alternates in deflation, off-loading pressure on the body and ensuring 2/3 of the body is always supported at any time. Additional features: · Provides very quiet pressure redistribution · Eight electronic comfort settings for both alternation and static modes · Mesh center strip keeps cells together and provides protection from slipping between cells in any position · "Happy Heel" digital foot section softness adjustment to maximize heel float, reduce heel pressure and protect from shear · Uses far less energy than traditional low air loss mattresses, greatly reducing operating costs