... speaker, plastic speaker, mp3 speaker, bluetooth speaker,USB speaker1.Recharge: USB charging, USB download charging, independent charging.2.compatible with CD player,PC/MAC,MP3 player,MP4 player ... , DVD player3.Mute function4.suitable for: Ipod, Sony Ericsson, NOKIA, SAMSUNG mobile phone,MP3 player ... so our products are more competitive bluetooth speaker for iphone 4