Aqueon Submersible Aquarium Heaters are made from thermal shatter-resistant quartz glass and were designed to absorb impacts making them extremely durable A LED indicator light comes on when unit is heating UL approved the heater is also programmed to turn itself off when not properly submersed to avoid overheating and damage Electronic thermostat ranges from 68° to 88°F  The suction cups make horizontal or vertical installation quick and easy
- 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 freshwater and saltwater aquariums up to 20 gallons
- 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 freshwater and saltwater aquariums up to 20 gallons