Feature:1. 1. It can not only ensure the heat output, but also keep the water temperature in the water tank stable.2. 2. The temperature indicating scale can be adjusted between 2034 (6893F).3. 3. Fully diving, double waterproof insulation, durable and safe design.4. 4. Power indicator light to ensure safe operation.5. 5. It can automatically adjust the temperature, which is good for the fish in the aquarium.Specification:Colour: BlackMaterial: glassPower: 25W/50W/100W/200W/300W (optional)Voltage: 220-240V/110-120v (optional)Frequency: 50/60HZTemperature range: 20~34/68~93 FItem length:25W: 19.5cm50W: 19.5cm100W: 25cm200W: 29.5cm300W: 29.5cmCable length: 90 cmPackage List:1*Heating rod2*Suction cupNote:1. This item is only applicable to fresh water.2. The heating rod must be completely immersed in water and exposure is not allowed.3. When the indicator light is on, it works.4. Before cleaning the aquarium or heating rod, turn off the power for 15-20 minutes and let the heating rod cool down, otherwise it will be burnt out.