... and stable, 3) electricity saving, high reliability and long lifespan 1, noiseless oil free air pump .Model: SL400Rated voltage: 110/220V ... molecule,adopting merging latest technology at home and abroad, top quality parts, professional making ,lower noise, smaller volume and ... No oil lubrication, air supply is cleaning and drying.Warranty period: One year 4, Always best quality, reasonable price and ...