When the water temperature is too low, it displays green, when the water temperature is too high, it displays red, and when the water temperature is suitable, it displays yellow. Safe material Made from virgin ABS material, this bath thermometer is heat-resistant and odorless. It has a smooth, burr-free surface, making it perfect for use as a baby bath thermometer. It's made from BPA-free materials, perfect for sensitive baby skin. Fun toys Our baby bath thermometer is effectively waterproof and doubles as a floating toy to make bath time more fun. The shape is small and cute, does not take up space, and is easy to carry when traveling.