This is a mini bluetooth speaker featuring a roller. It is small, but sounds great.
                                  
*Bluetooth Version: 2.1
*Rated Power: 2W; 
*Driver Unit: 33mm  
*Frequency Response: 120Hz~20kHz
*Receiving Range: ≥10M (No blocking)
*Power Supply: DC 5V
*Battery Type: li-polymer, 500mAh
*Operating Time: ≥6Hrs; 
*Charging Time: 2~3Hrs