... Voltage DC12V SNR <=85dB SpecificationsCard typeSD/MMC/USB Speaker output3W+3W Input powerDC5V,3.5mm port line in ... time3-5hours FM87MHZ-108MHZProduct Feature * This 3.5mm speaker can work with MP3,MP4,MD,CD,PAD and ... stereo effect, smooth sound. * Pure and clear sound quality with unsurpassed effect. * Enhances your music experience anytime and ... arrive. 2.0 active professional usb sd fm speaker box