Mobi Inked Headphonies Designer Micro Portable Speakers Works with iPod, iPhone, Mp3 players, CD players, computers, handheld video games and many cell phones Lithium Ion rechargeable battery lasts up to 4 hours on a charge Only 3 inches tall the amplified speaker gives incredible sound for its size Includes MP3/iPod connection cord Includes USB recharging cable and key chain loop