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Portable SD/TF card /U disk Mini speaker with FM [Fashionable] Multi-function integrated design, compact portable, full-featured, enjoy music life [TF Card / U Disk] Built-in MP3/WMA decoding, can directly play TF card, U disk, mobile and other USB storage devices stored MP3, WMA format music files [FM Radio] Built-in FM Radio,radio module, surrounded antenna, automatic station search, pristine sound quality, easy to use [U Disk Storage Function] Can copy the information through data cable connect to computer, which identify and use as a removable memory [Dual-Power] Dual-mode support for USB-powered, or lithium-ion battery-powered,have more choice [Built-in Low-freq Rad] Super dynamic low-frequency sound pressure gain, listening transparent and flexible [Memory Play] Auto remember the last song& play mode played [Intelligent Fast Charger] Charge using USB powered connecting to PC automatic fast charge [Non-Disturb Listening] Output-mode headphone-selection make non-listening disturb [AUX-Enter] Stereo AUX audio input, connect easily to laptops, digital music players, handhold TVs with wide range of audio-visual products Specifications Output(RMS):3.0W x 2 Speaker: 4Ω 3W Input Sensitivity:: AUX 600mV /FM 500mV /SD \USB 450mV Separation:≥80dB Distortion:1%(3.7V/1K/1W) Machine S/N: ≥80dB Charging power supply:DC 5V Operating Voltage: DC 3.7V Battery capacity: 1000mA