A:AnswerThere's no minimum strings of light recommended. You don't have to use all 6 outlets either. In fact we use our spare Mr. Christmas unit in our living room with no lights plugged into it and just play the music.
A:AnswerYes, it’s also for indoor use and will work with prelit trees. You can leave the ground stake off and Just be sure that if your tree has advanced remote controlled light sets that it is set to steady burn when using this unit. Otherwise the lights won’t synch with the music playing.
A:AnswerThey are digitized instrumentals, the songs are jingle bells, have a merry merry Christmas, white Christmas just to name a few. The sound is pretty good and they synchronize really well with the Christmas lights.