... 2.No power needed 3.Connect to PC,MP3,MP4,MD,CD,DVD player, mobile phone,etc Features: 1.cup cake stereo ... , simply plug the speaker into your player4.Connect to laptop,PC,Mobile Phone,Ipod,Iphone,MP3&MP4 Players and other digital products ... .Compatible with any audio electric player that uses a headphone jack7. Special Design like a cake Specifications: output power 2wfrequency response 200Hz ...