1.PTC Heating; 2.Vibration massage; 3.Bubble massage; 4.Magnetic force; 5.Infrared; 6.Double-walled housing; 7.Changeable massage attachment; 8.The inner depth is 12cm. Box size:40*22*45cm Carton size:82*46.5*47cm N.W.:11.8kgs/ctn G.W.:16.8kgs/ctn Packing:4pcs/ctn 696pcs/20` 1456pcs/40` 1580pcs/40`HQ