Aqueon Submersible Aquarium Heater 100 Watts Compact Electronic Thermostat LED

Fully submersible, auto shut-off when overheats, resets when cools down Electronic thermostat stops heating once set temperature is reached Precise temperature setting adjustable to 1° F (68-88° F) Shatter-resistant LED light turns on when aquarium water is being heated, automatic safety shut off and overheat protection For fresh or saltwater aquariums up to 40 gallons