1.17 air cells, water proof 2, With CPR valve 3.With normal and low pressure light and alarm 4.Alarm reset mode Overview:Anti bedsore mattress with pumpFeatures:Mattress:1.Size: .......................190 x 85 x12.50 cm2.Air cellsl:.................Nylon/PVC (EN-71, low toxic)3.Top cover................Nylon/ PU with button4. 17 air cells+1 exchangeable air cell5.Water proof and vaper permeable ...