A. Packaging contents: - 1 aquarium heater (This product is only suitable for fresh water). B. Aquarium heater - Easy to use, safe, and accurate: - The fully submersible heater can work in any position (horizontal or vertical) to provide a suitable water temperature for the aquarium. - A sensitive and reliable thermostat can keep the water temperature uniform. C. Specification parameters: - Voltage: 220V. - Power: 50W/100W/200W/300W/500W. - Length: 19 cm/23 cm/28 cm/32 cm/37 cm (7.48 inches/9.05 inches/11.02 inches/12.59 inches/14.56 inches). - Temperature range: 18℃ - 34℃. - Plug specification: EU standard. - Tube wall thickness: 0.5 mm. D. When shopping, it is advisable to pay attention to the product's size and specifications to ensure they meet your requirements. In the title and description, detailed information about the product, including its features and specifications, has been provided. E. We hope you are satisfied with this purchase. So if you have any questions or concerns, please feel free to contact us. We will do our best to help you. F. Thank you for choosing our product. We hope you like it.