DiGiYes&reg; Bluetooth 3.0 BoomBox NFC Speaker Protable TF Card USB Speaker Powerful Crystal-Clear Sound Subwoofer Sound Effect 3D Surround Sound Sensitivity LED Touchscreen Control FM Radio Mode With Battery (Red) NFC function ,NFC/Bluetooth function for all NFC/Bluetooth enable devices. U disk and TF card plug and play, with record function.. The NFC function:Only can be used by the product with this function.Bluetooth mobile phone open NFC function , and the speaker to ensure that the Bluetooth mode , the Bluetooth mobile phone and speaker module of NFC contact 2-3 Seconds . Hear the speaker voice and can increase the Bluetooth connection. LED touchscreen control, Powerful Crystal-Clear Sound Subwoofer Sound Effect 3D Surround Sound,enjoy your music life External high-capacity rechargeable battery, it can be used anywhere.Can use without battery when connecting the power source. 3.5mm audio output/input.. With FM radio function.Press the mode button, it will turn to FM mode / Bluetooth mode. Charging indicator:Charging Indicator:Indicator light will flash when battery is low.When battery voltage is lower than 3.2V,device will shut down automatically.Indicator light will be on when in charging status.When the battery voltage is higher than 4.2V,then,the charging light goes off,meaning charging is finished. The Boot Status:When first switch on ,device will enter into the Bluetooth mode,and will connect with the last mobile device which you connected before.You can be reminded by voice reminding. The sequeuence of playing modes : 1.If there is no USB stick/FM/Line-in inserted on device,when power on,the device will enter into Bluetooth mode automatically.When press the mode button,it will switch to FM. 2.If there is USB stick/FM/Line-in inserted in advance,when power on,the mode will switch from USB to TF to FM to Line-in to Bluetooth. 3.Priority of latest insert device:in real usage,the device will play the mode which is the latest inserted.For example,USB,TF,Line-in are all inserted ,and the Line-in is the latest inserted ,then,the device will go to Line-in mode.If plug out Line-in,then,the mode goes to USB.After you plug out USB,TF and Line-in,then,device go to FM mode,then to Bluetooth.