The Stage 1 Overlay Cushion is an alternating air pressure flotation seat cushion designed to prevent pressure sores for people with lower extremity or mobility disabilities, spinal cord injury and others who are at risk for pressure sores. It can be used in a wheelchair, automobile seat, or other chair. The bottom of the cushion has a cling type surface. The cushion is covered in breathable fabric treated to resist soil and stains. A clear vinyl plastic case protects the pump from spilt coffee and food particles. POWER: Uses rechargeable battery with a predicted life of over 500 recharges. The battery can be recharged in 2 hours and the unit operates for 48 hours on one charge. COLOR: Light grey fabric.