??MAIN FEATURES:   1). Bluetooth V4.0+EDR Works With Almost All The Mobile Phone Tablet PC Notebook Any Devices With Bluetooth Function Or Has A 3.5mm Audio Jack.   2). Built-in Micro-SD Card Slot Support 32GB Max Insert A Micro-SD Card With Downloaded Songs To Play Music.   3). FM Radio: FM Range 87.5 ~ 108MHz ( Please Search For The Radio Statioins At The Open Space In Order To Receive Better Signal ) .   4). 40mm dynamic alloy speaker drivers Tuned By Professtional Team  Super Bass High Fidelity Stereo Surround Sound enjoy the Wireless high quality music..   5). Smart Handsfree Talking: Built-in Concealed HD Microphone The Headphone Itself Has A Answer Incoming Phone Calls' Button To Pick Up Phone Call.   6). The Headphone Has A Standard 3.5mm Audio Jack Support Line-out Play Mode You Can Use 3.5mm Audio Cable Connect To Headphone To Listen To Music Used It As Wired headphone.   7). Foldable Design The Headphone Is Super Lightweight Earmuffs Are Made Of Soft Breathable Protein Leather Comfortable Wearing-on Experience.   8). Removable And Replaceable Battery Design 400mAh Lithium Battery Standby Time Up To 20 Days Playback Time Up To 8 ~ 10 Hours.       "