Waterproof and dustproof to ip65 ip68 specifications, the nw ws410 walkman will maintain operability when submerged in water to a depth of 2m for up to 30 minutes even in salt water. The swimming earbuds must be used for the waterproof design to function correctly. Please note, after usage in salt water always wash your walkman according to the supplied instructions work out in the height of summer or the depths of winter. The nw ws410 can handle almost any weather conditions and temperatures from 58451 to 458451. Ambient sound mode uses the microphones built into the left and right side of the walkman to allow you to hear the ambient sounds around you, even as you listen to music. So, you can listen to your fitness instructor or talk to your friends without missing a beat. This walkman is built into a headset with an all in one design that lets you focus on your workout rather than a tangle of wires.