ProCare® Lumbar Support, 2X Large, 1 Each Hip Knee Post Surgical Prdct 5 gallon capacity runs for Aluminum band assists in 5 gallon capacity runs for 18 24 hours of operation per filling and the triple wall insulation keeps the reservoir water at a safe temperature * There is an automatic shut off when the reservoir water reaches the minimum level * Has a locking top * The medicine cup allows the use of Vicks VaporSteam or KAZ Inhalant * A large night light provides added convenience particularly in children's rooms * 3 year warranty * Relieves tired sprains of the low back and abdominal area Extra extra large fits 55 – 60 inch male waists or female hips