The IP67 code designates the so-called „Ingress Protection rating“, which indicates how resistant a given device is to the ingress of foreign objects and liquids. The first digit „6“ signifies the highest possible protection against solid particles, meaning complete dust-tightness. Thus, no dust particles can enter headphones, a speaker, or a player. The second digit „7“ specifies water resistance and guarantees that the device can withstand immersion in water up to one meter deep for 30 minutes without damage.