... , connecting your MP3,MP4,CD,DVD,iPod,iPhone,iPad,GPS,PSP,mobile phone,notebook computer, etc. Metallic, shell shown noble and fashionable, ... )Signal and noise ratio of power amplifier: ≥80dBLoud speaker 1.77 inches (external diameter 45mm)Magnetic resistant 4OhmsPower supply: ... the menu, operate to play music.2, For all kinds equipments like blue tooth mobile, blue tooth adaptor, bluetooth player… ...