Pink Kaidaer MN-01 Mini Rechargeable Speaker Audio Amplifier for Laptop MP3 CD PC Ipod Iphone PSP Support Micro SD and perfect for most electronic devices like MP3,MP4, Music Phones, iPod,Portable CD Players, Notebook PC etc. Aluminum diaphragm micro-speaker, insure the sound quality. Buttons definition: "ON/OFF", "Repeat", "Stop/Pause", "Back/volume down", "Next/volume up", "EQ". EQ Sound button can be adjusted as following modes: Normal, Pop, Rock, Jazz,Classics, and Country. USB cable or Power adapter 5V/1000mA.