Use Integra 4-gram Integra Boost 2-way humidity control packs to control moisture in an enclosed area. The patented technology will either release or absorb moisture, maintaining relative humidity at 55% in a contained environment. It includes a smart, simple-to-read to Replacement Indicator Card with Integra Boost packs. Simply replace the old pack with a fresh one when the dot on the Replacement Indicator Card turns bright blue.