Abstract: A reel is constituted of two kinds of members including a spool and two trays. The spool and the tray are provided on the connecting surfaces with the same amount of the means to be hooked and the hooking means for hooking with each other. In this way, the spool and the tray can be connected with each other to form a reel for winding and fixing a tape. Further, one set of the means to be hooked and the hooking means has an idiot-proof design, so that they cannot be assembled with each other if only they are correctly aligned. With this idiot-proof design, the operators can easily recognize it to improve the guiding effect so as to prevent the mistake in assembling.

Abstract: The present invention discloses a protective cover suitable for mounting on a display screen of an electronic device to protect the screen. The protective cover has a convex lens for magnifying the displayed information content. The convex lens can be turned to cover on the surface of the screen, thereby to magnify the information content displayed on the screen. In addition, the convex lens can be used as a magnifying glass when a user intends to read a document paper.