Q : How many speakers ?
A : There are 2 for both sides and a subwoofer.
Q : How to use it ?
A : You can use as a wired speaker through wire, using SD card, pen drive, bluetooth (wireless).
Q : How to power ?
A : You can use usb power to power it up.
Mobile BT speaker
3D Surround sound, clear treble open the theater
Remote button coutrol
More convenient to use
Function: Bluetooth, U disk, FM, TF, AUX, Remote control
Speaker system: USB 2.1 speaker
Output power: 5W+3W*2
Audio cable: 3.5mm
Power: USB 5V/DC5V
Frequency response: 20Hz-18KHz
Product size: 10*13*13.2cm(Main)