... : 150~1800Hz(±3dB) 3. SNR : ≥80dB4. Loud Speaker : 2 inch ( external Diameter 45mm ) 5. Line in : Configure 3.5mm Stereo's Pluge ... unique full digital audio upgrade,The new aluminum disphragm micro-speaker,clear treble,basspure,unique design,the sound quality is even ... concept of integrated digital audio player,connect your MP3,MP4,CD,DVD,ipod,iphone,PSP,U disk,mobile phones,computers,Headphones and FM ...