Its 75 watts fully automatic glass heater, fully submersible, auto on off facility, suitable for tropical fresh water fish tanks, planted tanks, saltwater/marine tanks, brackish water tanks, turtle tanks, highly durable, maintenance Less, double glass protection, technology, full peace of mind, maintains stable aquarium water temperature throughout winter to keep fishes disease less, active. For keeping stable aquarium water temperature heater/thermostat during winter every year is mandatory and this is the model and wattage that can give stable temperature to aquarium water. Fully automatic, double glass protection, highly durable, maintenance less glass heater with double glass protection.