Color: Black Music Format: MP3 Power supply: Integrated batteries and rechargeable lithium polymer battery by 150mAh FM frequency: 76.0 - 108.0 mHz LED light: Lights up in red during operation and charging (to charge， please put the ON / OFF to ON state) Inserting the TF card and music playback card (TF memory card up to 16GB) FM radio Insert the TF card into the slot and put the ON / OFF to ON state. The flashing red light means that the device and ready to read the card and automatically play the music of the TF card. To listen to the previous / next， press the 'Volume -' / 'Volume +'. To listen to music or pause， press the 'Play / Pause'. ?With the method of reading the card， press the 'Mode' to change the way of FM radio. When the red light comes on， press the 'Volume +' / 'Volume -' to change to the previous / next， and press the 'Play / Pause' to automatically search for channels. Reload: Connect to the USB port of your PC via mini USB cable or USB adapter. 1 x MP3 player with headphones 1 x Data Cable "