Large design and built in 3.5mm cable works with any device with a 3.5mm jack. Ideal for iPod, iPhone, Androids, Smartphones and other MP3 players. Shock resistant outer and soft inner materials to protect your music player. Stereo speaker provide high quality sound. Built in easy access to power and volume controls. Hanging clip for belt loop or backpack. Measures approximately 19 cm x 12 cm x 4 cm, (7.5" x 4.5" x 2"). Works with two "AA" batteries, (NOT INCLUDED!!).