... Battery *High Power 20w *CE,FCC Approved USB/TF Card Reader Mini Portable Megaphone K-8500Product Features *Mini Portable, USB/ ... . *Multifunctions: Set USB, TF card port, microphone, speaker, voice amplifier, karaoke, recording.*SD/TF Card and USB support mp3, Ipod,Note ... .Product Specifications Output Power 20w Frequency Response 80Hz~12kHz Speaker Impedance 6Ω Working Voltage 7.2v~9v Battery Lithium ...