Features:Double seal material It can ensure the output of heat and keep the water temperature inside the tank steady Temperature indicating scale can be adjusted between 20~34C(68~93F) Totally submersible, waterproof double insulation, durable and safe design Can automatically adjust the temperature, good for fish in the aquarium Descriptions:Easy to use, safe, precise Automatic shut off when the temperature is reached Shatterproof glassSensitive and reliable thermostat maintains uniform temperatureSpecifications:Wattage: 25W / 50W / 100W / 200W / 300W (Optional)Voltage: 220-240V Frequency: 50/60HZTemperature range: 20~34C / 68~93FColor: blackSize:200*25*25mm, 195*25*25mm, 245*25*25mm, 300*25*25mm, 295*25*25mmPackage included:1 x heating rod Notes:Please allow 1-3mm differs due to the manual measurement Thank you