... ION. 2.Competitive price&High quality USD SD SPEAKER 1.Abundant supply and prompt delivery.2.Easy to ... handle, built-in BTL stereo amplifier, compatible with different audio device such as laptop, mobile phone,ipod ... MP3,MP4 and CD.Especially designed driver unit ,with beautiful sound.3.Using computer USB port instead of ... original L/C. High quality TF SPEAKER humburger speaker with superior quality