IP55 is a code that indicates the degree of a device's resistance to dust and water. The abbreviation IP stands for Ingress Protection, which is an international standard for protection against the ingress of foreign objects and liquids. The first digit '5' means that the device, such as headphones or speakers, is protected against the ingress of dust in a quantity that could impair its functionality. The second digit '5' indicates that the product is resistant to splashing water from any direction. In practice, this means that headphones or a speaker with this certification can easily handle rain, sweat during sports, or splashes of water, for example, by a pool. However, they are not designed for submersion in water.