Product advantages: compact and comfortable, easy to use, space-saving and easy to carry. Suitable for low water level environments. It is suitable for heating small aquariums, small turtle tanks and small tanks. Please purchase products that are suitable for you according to the amount of water. Working status: plug and heat, normal temperature increase 1-4°Cper hour, depending on the influence of water volume and ambient temperature. Low-light operation indicator, light below 25°C turns on and heats up, light will turn off above 25°C to stop heating. Low voltage power supply: safety power supply USB low voltage, 5V power supply with USB socket, suitable for use in a power bank, comes with a 2m power cable . Built-in automatic protection chip for constant temperature: once the temperature exceeds 25°C, the electric protection will automatically turn off.