... 3.5 Headphone Jack High-Fidelity Magnetic Speakers Noppal 158 Portable Mini Speaker For MP3,Micro SD/TF Card, Mobilephone, PC 1)Can ... play the mp3/WMA/WAV fomat audio files in usb disk,micro SD/TF card .2)Can be connected to ... ratio:≥80dBOutput: 3.7V*4.2VInput: 5.0V Noppal 158 Portable Music Mini Speaker For MP3,Micro SD/TF Card,Mobilephone,PC