①. change simple . . .. attached .. put on ....... board . goods .. attaching .. change ...... power music .♪
... .. . board . window the glass etc. sound ........ speaker ...........
② small size . ... speaker BOX un- necessary .... taking ...
.. .. . ........... Smart . close future goods . .. small size large sound ..♪
. a little 3W. therefore .. ho from separate exhibition ..USB audio amplifier .. charge un- necessary . correspondence .