Features: 1. Strong stability, high accuracy, beautiful appearance. 2. Precise temperature control, comprehensive heating full electronic LED digital display. 3. Double use of fresh water and seawater, exquisite appearance, no need to put the heating rod into the fish tank, effectively prevent the scalding fish. 4. Adjustable temperature control, excellent thermal conductivity, can withstand great temperature difference without bursting. 5. Design of inlet and outlet, 16mm/20mm inlet and outlet hoses can be connected at both ends. Specification: Condition: 100% Brand New Item Type: Aquarium External Heater Rod Material: ABS Color: As Pictures Shown Temperature Control Precision: 1-2℃ 300W Applicable Aquarium: Approx. 80-120cm/31.50-47.24inch 500W Applicable Aquarium: Approx. 100-150cm/39.37-59.06inch Package List: 1 x Aquarium External Heater Rod 4 x Inlet/Outlet 1 x Cleaning Brush Note: 1. It must be installed on the outlet pipe of the filter bucket or pump outside the cylinder. 2. The indicator arrow of the heater should be in the same direction as the water flow. If installed backwards, it will cause temperature deviation 3. The temperature control interval is adjusted from 20 to 35 ℃ at will, increasing 0.5 ℃ every time 4. The heater must pass water before it can be turned on for heating 5. Heaters should not be placed in water .