Specification:
1.MP3 technology parameters:
PC interface supports: USB2.0
Support music format:MP3
TF Card Support:128MB-16GB
Operating System:Windows98/SE/ME/2000/XP Vista MAC OS 9.2 And above
Operating current :≤30mA
2.Headphone specifications:
Type: Stereo Headset
Bluetooth version:3.0
Supported Bluetooth profiles:Hexafluoropropylene HFP A2DP AVRCP profile
Effective distance :8m
Battery capacity:300MA (Plus protection board )
Talk time:5hours
Music playback time :4hours

Button description:
On/off::Power switch
multifunction button:
1Press the mode switch (FM,Bluetooth mode,MP3 mode,when you insert TF card)
2.Press(play/pause/answer the phone /hang up the phone)
3.Up Stubbs(on a /long press plus volume)
4.Down Stubbs (under a /lomg press volume reduction)
TF card hole
USB Interface
Audio Input Interface 

Package include:
1 X Bluetooth headset
1 X Charging cable
1 X User's Manual