master replicase had it down from day 1,
string blades and removable battery and speaker were the thing 20 yrs ago and we are coming full circle and going this way more and more,
i see most sabers these days with fully removable speakers and battery and board and tbh i think its the best format.
i also see more and more led strip blades now too you dont see very many sinlge led sabers these days.