The SENTRY 1200 offers the therapeutic results and features you would expect to find in far more expensive systems. The superior technology, state of the art features and proven pressure relief allows caregivers to visually monitor the actual pressures in the inflated and deflated air cells. Low pressure, the goal of all pressure relieving surfaces, is displayed in one area while the inflated pressure, to prevent bottoming-out, is displayed in another. Unlike many lower cost systems on the market today, the SENTRY 1200 controller utilizes high-quality materials, electronics and sensors. The compressor itself is rated for 35,000 hours of use.