Integra Boost humidity regulators help create the perfect balance of moisture. Their patented technology adds or removes moisture to keep humidity levels at 62%. Keeping moisture as bay helps prevent rot and adding moisture helps maintain freshness. A replacement indicator is included to alert you when it's time to change the pack, it will change from red to blue. Each pack can protect moisture for up to 12 grams of plants. The packs are easy to use and are available in a 4 gram, 200 pack as well as an 8 gram, 144 pack.