Bluetooth wireless Speaker
1）Support systems：audio equipments with bluetooth functions,such as PC,cellphone,MP3… 
2）Bluetooth protocol standards：Bluetooth V2.1+EDR 
3）Receiver range：10m / 360。 
4）Carrier frequency：2402MHz-2480MHz 
5）USB interference:High speed USB 2.0 
6）Battery：chargeable lithium-ion polymer battery (3.7V/250MA/h) 
7）Charger power："computer USB interface DC5V;DC5V(500MA);
8）Successive working time：about 12 hours； 
9）Frequency response：20Hz—20KHz； 
10）S/N ratio：_82db；