This mini amplifier with USB slot, headset microphone, Lithium battery, cute surface design is Idea for entertainments ... Product Name: Minin Waistband Horn Speaker with Radio Program, Headset Microphone, Lithium Battery and Cute Surface DesignApplicationThis digital amplifier is ... the outside sound signal(such DVD, CD, MP3) from the MIC IN plug but from AUX IN plug and lower the ...