AeratorQuiet, powerful diaphragm pump. Runs on 2 C cell batteries (not included). 24 hose with filter stone to protect the pump.Features:24 HoseFilter Stone for Quality AerationRuns on 2 C cell Batteries (not included)WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.