The iHM79 is an amazing approach to audio that offers size-defying sound. Speakers connect to a computer or other USB power source via the included USB cable to recharge the internal lithium ion battery. Remarkable vacuum bass design gives surprising volume and bass response in speakers that fit in your palm. Perfect for laptops, cell phones, iPad, iPhone, iPod and other MP3 players, any audio source. Magnetic base for compact travel, includes carry bag.