Adjustable bluetooth 4.0 stereo headset with microphone support TF card USB

Feature: 

wireless, bluetooth, portable, headband, noise cancelling, stereo, volume control, free hand ,support TF card USB. 

parameter:

1.Bluetooth Specification:  jieli 4.0
2.Loudspeaker Frequency Response: 20HZ – 20,000HZ
3.Loudspeaker Diameter: 40 mm

4. sensitivity: 110dB

5. charge time: 1-2hours
6.Music Playback Time: ≥4 hours
7.Talk Time:4hours
9.Charging Port: Micro USB Type
10.RF Range :10 M

*product    
ITEM:200G                      
box size:16x122x82mm