Product advantages: Compact and practical, simple in appearance, space-saving and easy to carry. Suitable for environments with low water levels. Ideal for heating small aquariums, small turtle tanks, and small water containers. Please select a product appropriate for your water volume.Working status: Plug in and heat up. Normal temperature rise is 1-4 degrees per hour, depending on water volume and ambient temperature.Aquarium heaters are effective tools for maintaining aquarium water temperature. This product features a USB power input and a built-in thermostat. The thermostat adjusts heating output based on the water temperature to help maintain a stable environment.Built-in automatic protection chip for constant temperature control. This aquarium heater helps maintain a consistent water temperature for fish and other aquatic life.Compact design: This aquarium heater is a small and efficient heating solution suitable for small aquariums. It is easy to use and heats water quickly and effectively.Maximum power: 5V 10W Cable length: approximately 1.8 meters Recommended water volume: 1-2 liters