The Exhale Micro is a compact version of the original Exhale bag, designed for propagation and small areas. It requires no activation or electricity. The Exhale CO2 bag produces CO2 24 hours a day with a non-fruiting mycelial mass that contains patent pending genetics. Exhale Micro will produce enough CO2 for any standard propagation tray and is guaranteed to produce continuously for 3 months. Exhale is manufactured in the USA with the most stringent quality control standards in the industry. The Exhale bag is guaranteed to produce more CO2 longer than any other natural CO2 product available.