to the FM radio.Supplied with a 3.5mm cable that you can use to connect the headphone to devices without Bluetooth.Multifunctional keys allow you to power on/off, answer/hang up/reject/redial call, pause and play, vol+/-, next/previous track.EQ mode can be changed by short press FM/MP3 button (EQ mode includes Natural/Pop/Rock/Jazz/Classic/Country/Heave bass),?bring you vivid sound field, sound clarity and enjoy different styles of music.Powered by the lithium battery (can be charged via USB).G