... phone,notebook computer, etc. Metallic, shell shown noble and fashionable, out of ordinary, with many colors, several solution; for your option. ... USB, adaptor DC-5V allow you to enjoy the charm of digital products at any time. Speaker’s functional parameterOutput: ... =10%Frequency response: 150-1800HZ(±3dB)Signal and noise ratio of power amplifier: ≥80dBLoud speaker 1.77 inches (external diameter ...