Fluval Electronic Heater and Water Change Package for Aquariums up to 30 gallons 100 watt heater Aqua Minder 4 ounce AquaPlus included 4 ounce Cycle Included Electronic heater kit includes 100-watt Fluval Tronic Submersible heater, and flashing/beeping Aqua-Minder for maintenance Also includes Nutrafin Cycle Biological Aquarium Supplement and Nutrafin Aqua Plus Tap Water Conditioner Patented thermal sensor continuously monitors water temperature to maintain precise temperature control Numeric temperature dial makes it easy to select the desired temperature; safety shut-off feature For use with fresh and saltwater aquariums up to 30 gallons