Compact and lightweight. Mini digital audio with unique appearance and black colors. Aluminum diaphragm micro-speaker, insure the sound quality. Circular design, exquisite appearance, with 6 buttons. Buttons definition: "ON/OFF", "Repeat", "Stop/Pause", "Back/volume down", "Next/volume up", "EQ". 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 with red or blue LED light. Build-in lithium battery, rechargeable by USB port. You can enjoy perfect stereo sound produced from the metal speaker. This compact travel speaker is ideal for use at the office, home, or carry to where you go.