The specification of best sounding Bluetooth speakers

1.Use wireless Bluetooth v4.0                                                                2.Support TF card, NFC  
3.With handsfree, built in microphone   
4.With 3.5mm line in port                                                                         5.Support all Bluetooth device

Attribute Attribute value
Bluetooth version Bluetooth v4.0
Frequency range 2.4GHz~2.48GHz
Output Power 2x5W THD=1%
Range about 10m
Frequency response 20Hz-20kHz
Play time about 6 hours 
Input sensitivity 800mV 1kHz
Charging voltage DC 5.0V,500 mA
Charging time  about 3.5 hours
Battery  3.7V 2200mAH