Bluetooth: V4.2
<br />Transmission distance:   10M
<br />Built-in battery: 3.7V  2000mah*2 battery( With good brand protective plate).        
<br />Working voltage: 3.7V (3.2-4.2V)         
<br />Charging input voltage:DC5 0.25V
<br />Freduency: 90Hz-20KHz                                                          
<br />Music playing time:   8H  
<br />Talking time:  14H
<br />Standby time   60 days
<br />Three mode: Bluetooth model
<br />                   TF-flash card mode
<br />                   AUX line connect mode
<br />Size:203*72.8*72.8mm
<br />Weight: 500g
<br />Color: Yellow, Black.