Anti Bedsore Mattress based on alternative pressure pad & pump system. Power supply: 220V/50Hz, 1A/250V, Air output: 6-8 liter/min. Pressure range: 30 mmHg – 100 mmHg. Top cover: Nylon / PU with button Size:190cm(L) x 85cm(W) x 11cm (H). Exchangeable air cell, water proof. Low Noisy, Long life time benefit.