Product advantages: compact and practical, simple in appearance, space-saving and easy to carry. Suitable for low water level environments. 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 state: plug in and heat, the normal temperature rise is 1-4 per hour, depending on the influence of the amount of water and the ambient temperature. Aquarium heaters are the perfect tools for heating your aquarium. This product has a USB port and a thermostat. Depending on the temperature of your aquarium, the thermostat will send different signals to the heater. " 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. COMPACT ROOF HEATER: "The aquarium heater is a perfect heating system for all living things in your aquarium. It is a small and powerful heater that