Sealed heater, fully submersible and fully automatic. When using the semi-submersible type, the tube will not burn if the water level does not exceed the warning limit. The heater can be placed at any angle, and the top thermostat is easy to use. The temperature can be adjusted comfortably and precisely, which can be seen on the indicator. The sensitive and reliable adjustment ensures the stable temperature you desire. It can be used in freshwater or saltwater with a compact design that fits most aquariums. Includes mounts and stickers for the ideal positioning you want in tanks. Specifications Voltage (V): 220 V - 240 V Frequency (Hz): 50/60 Hz