SCUBA heaters are suitable for all types of aquariums and are highly valued for their delicate design. They are accurate, reliable and fully immersed. High thermal and durable protection from glass and plastic. Thermo-safe control: switch off when out of water Temperature range Celsius / Fahrenheit for temperature regulation. 2 suction cups included. Submarine to a maximum depth of 1m. Minimum level indicated on the glass for proper operation.