This heating rod can ensure the output of heat and keep the water temperature inside the tank steady. It can automatically adjust the temperature so that it’s good for fish in the aquarium. Features: It can ensure the output of heat and keep the water temperature inside the tank steady. Temperature indicating scale can be adjusted between 20~34°C(68~93°F). Totally submersible, waterproof double insulation, durable and safe design. Power indicator, ensures safe operation. Can automatically adjust the temperature, good for fish in the aquarium. Specifications: Color: Black Material: Glass Plug: EU Plug Wattage: 25W / 50W / 100W / 200W / 300W (Optional) Voltage: 220-240V Frequency: 50/60HZ Temperature Range: 20~34°C / 68~93°F Item Length: 25W: 20.5cm / 8in 50W: 21cm / 8.27in 100W: 25.5cm / 10in 200W: 29cm / 11.43in 300W: 29cm / 11.43in Cable Length: Approx. 85cm / 33.5in Package Size: 25W: 26.5 * 7 * 4cm / 10.4 * 2.76 * 1.57in (L * W * H) 50W: 26.5 * 7 * 4cm / 10.4 * 2.76 * 1.57in (L * W *