It can ensure heat generation and maintain the water temperature in the balance tank. The temperature indication scale can be adjusted between 20 ~ 34 (68 ~ 93 F). Fully submersible, waterproof double insulation, durable and safe design. Power indicator light, ensure safe operation. Can automatically adjust temperature, good for fish in aquarium. Product DescriptionSize: 25WFeatures: It can ensure heat generation and maintain water temperature inside the stationary tank. The scale indicating the temperature can be adjusted between 20 ~ 34 (68 ~ 93 F). Fully submersible, waterproof double insulation, durable and safe design. works, guarantees safe operation. can automatically adjust the temperature. temperature, good for fish in the aquarium. Specifications:color:blackmaterial:glass cap: MP3 Random Playback Power: 50W / 300W (optional) voltage: 220-240v frequency: 50/60HZ ambient temperature: 20~34 / 68~93 Point length: 50W: 21cm / 8.27in 300W: 29cm / 11.43 in Cable length: approx.