300 Watts Aquarium Glass Submersible Heater (Tank Size 60-100 Gallon) Temperature Range 18~32'c (64&deg;f and 90&deg;f.) Easy to attach on aquarium tank wall with 2 suction cups Temperature range: 18~32'C (64~90'F), suit for tank size 60-100 Gallon Fully submersible, waterproof double insulation and durable. Automatically adjust the temperature Safe and reliable in both fresh and salt water aquariums Material: Plastic + glass