Estone Sport Wireless Headset Headphone Earphone Music MP3 Player Micro TF FM Radio Black 1.Built-in high-performance polymerized cell offers high safety and stability and avoid over-charge and over-discharge 2.For use of this product, switch the power button to "on" and the LED turns on, press the function button (MODE) and the default status radio is enabled and the earphone works 3.MP3 playback: Insert TF card in proper direction and the product automatically switch to MP3 playback mode to play music. Press forward or rewind to perform the corresponding operations. Press button &gt;|| to pause playback 4.Volume control: Long press the Forward/ Rewind button to volume up or down,5.Power off: Push the switch to "OFF" Note: The TF card not included.