Headphones are compatible with CD players, MP3 players, iPods, iPhones and computers with 3.5mm plug In-Ear Earbud-Style Headphones for Added Comfort Ultra Lightweight Design Easy-to-use Listen to your favorite music with these super cute Hello Kitty HK-11429 earbuds. With great listening quality, each earphone is beautifieL with Hello Kitty logo. The in-ear/earbud style offers added comfort and with its 3.5mm plug, this Hello Kitty earbuds is compatible with CD players, mp3/mp4 players, and other portable audio/video devices.