Ultra Short Quartz Glass Heating Rod For Aquarium Heater Completely submersible type Automatic aquarium heater Easy and precise setting to the desired temperature Thermometer style temperature indicator is easily visible Sensitive and reliable thermostat maintain uniform temperature Heating element is highly efficient and compact Designed for extended use and completely safe Supplied with strong support clips Features : A simple to adjust temperature control, ranging from 12°-34° Suitable for : Use in Cold water, Tropical and Marine aquariums. Note: Never remove the heater from the aquarium when it is turned on. Once installed, allow 10-15 minutes before turning the heater on, and allow the same amount of time before removing the heater from the aquarium. Cable length of heater = 193 cm