Alternating Pressure Air Mattress with Pump - Pressure Relief Seat Cushion for Wheelchair - Inflatable Medical Pad for Pressure Ulcer & Sore Treatment - Ideal for Home Care, Hospitals & Elderly Comfort

Not only does it not have instructions but it doesn’t seem to alternate pressure. Just feels like a blow us cushion. Would return but I didn’t get to try it out until too late to return. Waste of money.