It can ensure the heat output and maintain the water temperature in the equilibrium tank.Temperature indicating scale can be adjusted between 20 ~ 34 (68 ~ 93 F).Totally submersible, waterproof double insulation, durable and safe design.Power indicator light, ensures safe operation.Can automatically adjust the temperature, good for the fish in the aquarium.Product DescriptionSize: 25WFeatures:It can ensure the heat output and maintain the water temperature inside the stationary tank.Scale indicating temperature can be set between 20 ~ 34 (68 ~ 93 F).fully submersible, waterproof double insulation, durable and safe design.works, guarantees safe operation.can automatically adjust the temperature, good for the fish in the aquarium.Specifications:color: blackmaterial:glass plug: MP3 shufflepower: 50W / 300W(optional) voltage:220-240v frequency:50 / 60HZ ambient temperature: 20 ~ 34 / 68 ~ 93 Fpoint length:50W : 21cm / 8.27 in300W: 29cm / 11.43 inCable length: approx. 85cm / 33.5 inNote:1. This item is only suitable for fresh water.2. The heater bar must be completely submerged in water and no exposure is allowed.3. When the indicator light is on, it is working.4. Before cleaning the aquarium or the heating rod, please turn off the power for 15-20 minutes to cool off at the heating bar, or you will be burnt.Package List:1 * Heating Rod