Make sure the product voltage is consistent to the local one.
IMPORTANT:
Before removing heater from aquarium, disconnect from electrical outlet and allow heater to cool in aquarium for 15 minutes.
The heater should NEVER be connected to an electrical outlet while out of the aquarium.
Aquarium water level should never be allowed to drop below indicated “water line” inside tube. These actions constitute misuse and may result in overheating damage to heater and environment.
For household use only.
25 Watt ~ 25 Liters/6.5Gal (for every 1L water you'll need at least 1 watt heater)