EM-28 Bluetooth Speaker, 2.0-Ch Stereo, MIC, New arrival, Classic design  
Bluetooth Speaker Features:
 Mondrain Style classic design
Bluetooth V4.0
2.0-channel stereo speaker
Double speaker units, 3Wx2
MIC, support handsfree talking
Aux line-in External volume adjustment buttons  

Product Parameters:
Output: 3W x 2
Bluetooth standard: V4.0
Speaker: 40mm x 2
Built-in battery: 3.7V 1000mAh
Input voltage: DC 5V
Charging time: 3 -4 hours
Playing time: up to 9 hours
Impedance for speaker: 4ohm
THD: <1% (1Khz/1W)  
SNR: >96dB
Frequency Response: 90Hz to 18KHz
Reception distance: 10m
Dimension: 155(L) x 54(W) x 59(H)mm