... iphone,samsung,ipad New arrival mini usb speaker amplifier speaker Icon and function explanation: New mini aluminum vibration film loud ... The unique design makes tone performance perfectMetallic ,shell shows noble and fashionable, out of ordinary, with many colours ,several ... =10%Frequency response: 150-18000HZ (+3dB)Signal and noise ratio of power amplifier: ≥80dBLoud speaker: 1.77 inch (external ...