Product advantages: compact and practical, simple appearance, space-saving and easy to carry. Suitable for environments with low water levels. It is suitable for heating small aquariums, small turtle shells, and small tanks. Please purchase products that suit you depending on the water volume. Working status: plug in and heat, the normal temperature increase is 1 to 4 per hour, depending on the influence of water volume and ambient temperature. Aquarium heaters are the perfect tools to heat your aquarium. This product has a USB plug and a thermostat. The thermostat sends different signals to the heater depending on the temperature in your aquarium. \"Built-in automatic constant temperature protection chip: The aquarium heater is a fantastic small heater that can maintain the desired water temperature for your fish. COMPACT DAUCHSIEDER: \"The aquarium heater is a perfect heating system for all living creatures in your aquarium. It is a small and powerful heater that fits in the palm of your hand. This product is perfect for small aquariums. It is small, easy to use, and fast. The small, easy-to-use mini heater heats the water quickly and efficiently. \" Maximum power: 5V10W Cable length: approx. 1.8 meters Suitable water volume: approx. 1-2 liters