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Features:1. Stereo resonance speakers (with sonorous treble and resonant bass)2. Radio flash disk TF card 3.5mm line in port remote control 3. Supporting flash disks, TF cards, MP3/MP4/MP5 players, computers and mobile TVs (with the 3.5mm line in port)4. Built-in high capacity battery which can be charged through the USB ports of computers or with MP3 or MP4 chargers.5. Operated with infrared remote control and powered by built-in lithium battery Parameters: Operating voltage: 5V Input mode: TF cards and flash disks; external signals input through the 3.5mm line in port. Rated impedance: 4 Ohm Frequency response: 100Hz-18KHz Maximum power output: 3W×2 Battery capacity: 850mAh Continuous working time of battery: More than 2 hours Application scope: Suitable for TF cards, flash disks and all digital products with the standard 3.5mm audio output port, such as MP3 players, MP4 players, mobile TVs.