... Cell Phone Stereo Speaker with SD Slot. With this Mini Stereo Speaker, you can enjoy the music from mobile phone, MP3, MP4, PC, and other ... equipped with ON/OFF/AUX switch, 3.5mm PHONE jack, 3.5mm audio cable, Vol- button, vol+ button, play/pause button, SD slot ... can play music sourcess from mobile phone, MP3, MP4, PC, etc. This SD Speaker with built in rechargeable Li-ion battery for convenience ...