... USB drive and TF card mini portable speaker for mobile phone Description:100% Brand New!Mini Aluminium Vibration Music Player Speaker ... shows noble and fashionable, out of ordinary.3. Several power supply manners including: Battery, computer USB, adaptor DC-5V ... 3dB)Signal and noise ratio of power amplifier:?80DbMagnetic resistant: 4 OhmsPower supply: USB power supply availableColor: Silver, Pink, Blue ...