Medium/joint Size 14 X 14 * Designed For Arthritis Sufferers * New Four-stage Therapy Switch Provides Optimum 20-minute Treatments * Simple One-touch Control Features Auto Shut-off Timer * Produces Intense Moist Heat Without Adding Water * Fast-acting Therapy Relieves Pain And Stiffness For Hours * Shipping Carton Size: 16 L X 12 W X 4 H