2014 hot seller metal  bluetooth speaker  BTW11 

     *  BT Version:  Bluetooth V3.0;      
     *  Bluetooth  protocol: A2DP
     *  Frequency Response:2.402-2.480GHz.  
     *  Rated power: 3W,       Sensitivity: 450mV  
     *  SNR:≥68db                  Separation: ≥ 70 dB
     *  THD: ≤ 0.1% (3.7V/1KHz/1.8W)
     *  Voltage of Charge power :4.2-5.2V,    Output:3.7V-4.2V /200mA
     *  Charge time: 2~3 hours                                                                                                                                         
     *  Play time: about 8hours (Max Volume) 
     *  Speaker drivers: 400mm, 4Ω/3W
     *  Transmission range: <10 meters
     *   Material: Metal+ABS PlasticMAX Power output:3W 
     *  MIC Sensitivity:-32db .
     *  Receive Sensitivity:Better than +82dBm.
     *  Range:10meters 
     *  Data Transmission:Up to 3Mbps
     *  UART Data Transmission Rate:115200bps .
     *  Battery :450MAH.
     *  Antenna:Built in              

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