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:

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.

A.B  Specifications:Only 1 * Heating Rod

• Color: Black
• Material: Glass  
• Plug:US Standard
• Wattage: 50W / 100W / 200W / 300W /500W(Optional)
• Voltage: 220-240V 
• Frequency: 50/60HZ
• Temperature Range: 20~34C / 68~93°F
• Weight: 170g~ 260g 
• Item Length: 
• 25W: 20.5cm / 8in
• 50W: 21cm / 8.27in
• 100W: 25.5cm / 10in
• 200W: 29cm / 11.43in
• 300W: 29cm / 11.43in
• Line Length: 80cm

C Specifications: 1* Heating Rod+Protect Case

• Color: Black
• Material: Stainless Steel
• Plug:EU .US Standard
• Wattage: 50W /  100W / 200W / 300W (Optional)
• Voltage: 220-240V 
• Frequency: 50/60HZ
• Temperature Range: 16~32C
• Weight: 300g~ 400g 
• Item Length                                             Protective Sleeve  Length
• 50W:16CM/6.29in         18.5cm(the protective sleeve can not be split joint and change the length)
• 100W:29CM/11.4in       24.5cm(1 x can be split joint and change the length)
• 200W:29CM/11.4in       30.5cm(2 x can be split joint and change the length)
• 300:35CM/13.78in        36.5cm(3 x can be split joint and change the length)
• 500W:35CM/13.78in    42.5cm(4 x can be split joint and change the length)
• Line Length: 120cm

Note:
1. This item is only suitable for fresh water.
2. The heating rod must be totally immerged into water and no exposure is allowed.
3. When the indicator light is on, it is working.
4. Before cleaning the aquarium or heating rod, please turn off the power for 15-20 minutes to cool off the heating rod, or you will be burned.

Package List:
Type A.B 1 * Heating Rod

Type C 1 * Heating Rod + 1* Protective Sleeve