... .5 Headphone Jack High-Fidelity Magnetic Speakers Noppal Q7 Portable Music Mini Speaker For MP3,Micro SD/TF Card, Mobilephone, PC 1 ... ratio:≥80dBOutput: 3.7V*4.2VInput: 5.0V Noppal Q7 Portable Music Mini Speaker For MP3,Micro SD/TF Card,Mobilephone,PC