... 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: 5V/1000mA AC ... blue tooth, turn in the speaker, there is flash indicator light. Ex: search blue tooth in the mobile, will present MUSIC ANGEL ...