The IP65 protection rating indicates the resistance of electronic devices, such as headphones, speakers, or MP3 players, against the ingress of foreign bodies and water. The abbreviation IP stands for 'Ingress Protection', an internationally standardized rating. The first digit '6' signifies the highest possible protection against solid particles, meaning the device is completely dust-tight and no dust can penetrate its interior. The second digit '5' specifies water resistance, specifically protection against jetting water from any direction. A device with this certification can thus easily withstand rain, sweat, or splashing water, but it is not designed for submersion.