Fully enclosed heater, completely submersible, and fully automatic. When using the semi-submersible type, the tube will not burn out if the water level does not exceed the warning level. The heater can be placed at any angle, and the upper temperature control unit is easy to use. The temperature can be adjusted comfortably and precisely, as indicated on the gauge. The sensitive and reliable adjustment ensures the stable temperature you desire. It can be used in freshwater or seawater with a compact design that fits most aquariums. Components include brackets and suction cups to achieve the ideal position you desire in aquariums. Specifications Voltage (V): 220V-240V Frequency (Hz): 50/60Hz