1. Peripheral equipment of Mp3 player,Mp4 player ,Walkman ,computer and the like 2. Fashionable .exquisite ,compact and portable 3. Unique concealed line design that can collect the audio line in the line casing or carrier easily 4. 3.5mm stereo audio plug matching with the player’s (eg.Mp3 player, etc.) audio jacket 5. Equipped with power switch and indicator 6. Power by dry battery ,1.5V×4PCS 7. 6V DC power jack available for long time power supply 8. User can use the volume-knob to control the voile volume directly