The Sony headphones MDREX15APPI are practical earphones for the train, on vacation or on the road. Enjoy carefree music enjoyment anytime and anywhere with these high-quality headphones and use the product for smartphones, tablets or MP3 players. The pleasantly soft silicone provides the necessary comfort and a secure hold in the ear. The special feature is the 9 mm neodymium driver for a powerful, authentic and first-class sound. The light weight is also pleasant. The frequency range of the headphones extends from 8 to 22,000 hertz. In-ear headphones are inserted directly into the ear canal. The resulting pressure chamber effect provides a powerful sound experience without having to turn the music up too loud. This is gentle on your ears and also extends the battery life of your playback device. What's more, in-ear headphones have excellent noise-cancelling properties - so you'll be much less aware of disturbing ambient noise. They're compact enough to fit easily in any pocket, making them the ideal companion for travel, and the completely closed design of these headphones is not air-permeable, but offers powerful sound and rich bass. In addition, disturbing outside noises are very well damped. Also vice versa, good isolation is provided: outsiders practically cannot hear your music.