... concept integral stereo portable mobile music, connecting your MP3,MP4,CD,DVD,iPod,iPhone,iPad,GPS,PSP,mobile phone,notebook computer, etc ... : 150-1800HZ(±3dB)Signal and noise ratio of power amplifier: ≥80dBLoud speaker 1.77 inches (external diameter 45mm) ... For all kinds equipments like blue tooth mobile, blue tooth adaptor, bluetooth player… The key- presses can not work while using LINE IN. Portable ...