Abstract: A head-mounted display device and an external adjustment module are provided. The head-mounted display device includes a body and the external adjustment module. The body has a first lens and a second lens corresponding to both eyes, and also has a driven mechanism. The first lens and the second lens are respectively coupled to the driven mechanism. The external adjustment module includes a driving element and a transmission element. The transmission element is assembled to the driving element and used for coupling to the driven mechanism. The driving element is used for driving the driven mechanism through the transmission element to adjust a distance between the first lens and the second lens.

Abstract: A memory storage apparatus and a memory controller and an audio playing method thereof are provided. The memory storage apparatus includes a connector, a rewritable non-volatile memory module, the memory controller, and an audio playing unit. The audio playing unit is coupled to the memory controller via at least one signal control pin and has a speaker and an audio control circuit. The memory controller transmits status information to the audio playing unit via the signal control pin. Besides, the audio control circuit decodes an audio file according the status information and controls the speaker to play the decoded audio file. Thereby, a user can be effectively alerted about the current status of the memory storage apparatus.