FlowCushion works like no other air cushion. Using a patented, state-of-the-art microprocessor-controlled pump and valve system, air pressure is alternated within a series of small bladders in order to promote relief on the various pressure points on your leg and coccyx muscles. These bladders inflate and deflate in a steady, quiet rhythm to lift and shift the body as it sits. As you sit on Flow Cushion, blood circulation is continually enhanced. You may feel less tired and sore after several hours of sitting, and therefore more energetic. You may feel, too, that your posture improves, thereby reducing the opportunity for leg cramps and/or carpal tunnel syndrome, and other maladies associated with poor posture. Each Flow Cushion is equipped with a rechargeable battery pack for easy transport. Battery power for the built-in air pump lasts approximately 50 hours - perfect for use on airplanes, cars, wheelchairs and the outdoors. The simple light system indicates the strength of your power supply. A dual-voltage recharger is included for home and office use, and special adaptor plugs for foreign outlets are also available.