Speaker :4 ohm 2.5 w +2.5w Li-hi battery 3.7 v 400 MA Frequency Response : 80 Hz - 18 kHZ S/N Ratio : > 65 dB New Design Portable Vibration speaker Function Description Technical ParametersPackingSupport SD/MMC card,USB,FM radio,Adapt to MP3, MP4, cellphone ,PC etc other external devices MOQ:2000PCS MaterialPlasticSpeaker :4 ohm 2.5 w +2.5wLi-hi battery 3.7 v 400 MAFrequency Response : 80 Hz - 18 ...