This combo pack contains one wire audio amplifier board and one wire less audio amplifier board.
You get the connection diagram from above pics. This two board works on 5V supply. You can use mobile charger also to power this board. Now both board support 3W speakers on left and right side means total 6 watts. Left and right speaker available. 
Wireless board works on bluetooth connection. and wire board works on headphone cord.
Both circuit board are seperate.