An electronic device includes a main unit having a first housing with a groove and a speaker having a second housing and an adjusting rod. The groove has a limiting section and a stop portion receiving section, a minimum width of which is greater than that of the limiting section. The adjusting rod has a rod body extending through the limiting section, and a stop portion received in and rotatable relative to the stop portion receiving section and having an outer diameter greater than the minimum width of the limiting section. Through the cooperation of the adjusting rod and the groove, the speaker is multi-directionally adjustable relative to the main unit.