The Sony headphones MDREX15APPI are practical earbuds for the train, on vacation, or on the go. Enjoy carefree music enjoyment anytime and anywhere with these high-quality headphones, and use them with smartphones, tablets, or MP3 players. The pleasantly soft silicone ensures necessary comfort and a secure fit in the ear. A standout feature is the 9mm neodymium driver that delivers powerful, authentic, and premium sound. The lightweight design is also a plus. The frequency range of the headphones extends from 8 to 22,000 Hertz. In-ear headphones are inserted directly into the ear canal, creating a pressure chamber effect that allows for a powerful sound experience without needing to turn up the volume too high. This is gentle on your ears and also extends the battery life of your playback device. Additionally, in-ear headphones have excellent noise-canceling properties, significantly reducing the perception of disturbing background noise. Thanks to their compact size, they can be easily stored in any pocket, making them the ideal companion for on-the-go use. The completely closed design of these headphones is not very breathable but offers powerful sound and rich bass. Furthermore, external noises are effectively dampened. Conversely, good isolation is ensured: outsiders can hardly hear your music.