Boveda is the only product on the market that adds or removes moistures needed, to maintain precise relative humidity in a containerYou can never use too many Boveda. Using more than the minimum will work more efficiently and last longer!Absorbs excess humidity if neededWon’t over-humidify,  preventing moldNo maintenance or refillingNo activation requiredProximity & direct contact won’t damage goodsLASTS 2 TO 4 MONTHS DEPENDING ON CONDITIONS