... /RoHS certificate 3.Stereo sound, quite clear Minitype speaker with USB cable for laptop ,ipod,iphone *Stereo sound, quite clear *Portable , ... .* Digital audio amplifier, full frequence speaker, let your ear with transparent sound effect product details: model JH-M3030Machine dimension 83 ... Application: MP3 ,MP4,computer,mobile phone,etc. mini music speaker with USB cable for laptop &mobile phone