The water resistant specifications (*1) of this Walkman are equivalent to IEC 60529 “Degrees of protection against ingress of water (IP Code)” IPX5/8 (*2), which specifies the degree of protection provided against the entry of water.
If you use your Walkman in a swimming pool, do not exceed a depth of 2 meters (6.5 feet) while wearing it. Before use, be sure to read and understand the water resistant specifications completely.

^(*1) The headphone sections are not water-tight.

^(*2) IPX5 (Degrees of protection against jets of water): Your Walkman, with Swimming earbuds attached, will maintain its operability even when exposed to direct streams of water from any direction in a situation where approximately 12.5 l/min. of water is supplied for more than 3 minutes from a distance of about 3 meters using a nozzle with an inner diameter of 6.3 millimeters. However, this does not apply to the headphone sections.
IPX8 (Degrees of protection against continual water submersion): Your Walkman, with Swimming earbuds attached, will maintain its operability even when submersed in water to a depth of 2 meters for 30 minutes.