1) Multifunctional wireless headband earphone, can be used as MP3, FM radio, voice recorder, card reader. 2) With TF card slot. 3) Button function: Switch on/off/play/pause/automatic searching. 4) On a radio/song/a volume reduction (long press). 5) The next song/next station/volume plus (long press). 6) Recording/playback. 7) FM/MP3 mode conversion. 8) Indicator. TF card slot. Charging/data interface. Earbuds. 9) Charging: connect the USB cable to devices and the computer, or with USB interface DC power plug(5V). Red light when USB cable connect with the devices. Blue light when charging full. Working state, when the battery voltage is too low, will be bright red light, the machine will automatically shut down, please recharge in time. Can stretch 3cm. 10) Material: ABS PC 11) Max Extended Capacity: 64GB 12) Battery Capacity: 1000mAh 13) Working Time: 4Hour 14) Battery Type: Li-ion battery 15) Power Supply: 5V 16) Size: 15cm x 15cm x 4.2cm Package included: 1 x Earphone 1 x USB cable (75cm) 1 x Chinese / English user manual