Product advantages: compact and practical, simple in 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 are suitable for you according to the amount of water. Working status: plug in and heat up, the normal temperature rise is 1-4 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 socket and a thermostat. The thermostat sends different signals to the heater depending on the temperature of your aquarium. " Built-in automatic protection chip for constant temperature: The aquarium heater is a great little heater that can maintain the desired water temperature for your fish. KOMPAKT DAUCHSIEDER: "The aquarium heater is a perfect heating system for all living things in your aquarium. It is a tiny and powerful heater that fits in the palm of your hand. This product is perfect for small aquariums." It's small, easy to use and fast The small, easy to use mini water heater heats water quickly and efficiently." Maximum power: 5V10W Cable length: about 1.5 meters Suitable water volume: about 1.5-3 liters