Submersible Usb Aquarium Heater, Adjustable 20/25w, 18-34°c Fish Tank Warmer. Enhance Your Aquarium Setup with This Compact and Efficient Heater, Specifically Designed for Small and Micro Tanks. It Offers Precise Temperature Control Ranging from 18°C to 34°C, Maintaining an Impressive Accuracy of 0.1 Degrees. This Ensures That Your Aquatic Pets Thrive in the Perfect Environment. The Sleek USB Micro Cylinder Design Allows for Easy Installation and Straightforward Adjustments. Although It's Compact, This Heater Effectively Serves Tanks Up to 4 Liters. Its Energy-efficient Nickel Soldering Heating Wire, Encased in a Black Gold Sand Shell, Enables Rapid Energy Conversion. Built to Withstand Challenging Conditions, It's Resistant to Acid and Alkali, Making It Suitable for Both Freshwater and Saltwater Settings. Rigorous Quality Testing Ensures High Standards of Performance and Reliability. Key Features: - Precise Temperature Control: Adjustable from 18°C to 34°C with 0.1-degree Accuracy. - Compact Design: Ideal for Tanks Up to 4 Liters. - Efficient Heating: Nickel Soldering Wire with Black Gold Sand Casing for Quick Energy Conversion. - Durable Construction: Resistant to Acid and Alkali for Versatile Use. - Quality Assurance: Thoroughly Tested for Superior Performance and Reliability. Specifications - Power: 25W - Material: Stainless Steel - Size: 7 X 2 Cm - Plug Type: EU Plug - Voltage: 110V Includes: - Aquarium Heater X 1.