The system involves a thin, pressure-sensing mat placed on the bed beneath the user's shoulders to sense his position (beneath sheets is fine), a pillow, an air pump, and a controller. After setting preferences for flat sleep and side sleep, the user goes to bed and the pillow quietly does the rest. As the sleeper changes positions, the mat senses the change, triggering the pillow to slowly adjusts its two internal air chambers (upper head and lower head) in about half a minute so to not disturb the sleeper. The air pump is quiet (37dB, two feet away--definitely silent in the crowded conference center where I saw it). The company says the pillow should be available in mid-2013 and will probably cost between $250 and $300.