The rena air pumps offer you power silence and versatility in one attractive packagethese pumps maintain optimum flow even in the deepest of aquariums and are so quiet that they can be used in any room in the house ndash even the bedroomextremely quietunique construction of the rena air pumps reduces vibrations and residual noises less than 30 db at a distance of 1 meterr unique design fitting of base to casing guarantees soundproofing special extension chambers rena air 200 to 600 a