BestDealUSA Mini Audio Speaker Amplifier for Laptop MP3 MP4 Music Phones iPod by BestDealUSA. $11.66. Circular design, exquisite appearance, with 6 buttons. Buttons definition: &quot;ON/OFF&quot;, &quot;Repeat&quot;, &quot;Stop/Pause&quot;, &quot;Back/volume down&quot;, &quot;Next/volume up&quot;, &quot;EQ&quot;. Ports including: 3.5mm stereo port, Micro SD, USB(connect to computer or charge up). Support Micro SD and perfect for most electronic devices like MP3, MP4, Music Phones, iPod, Portable CD Players, Notebook PC etc. Bottom wit...