Abstract: A multilayer screen protective film comprises a first protection unit and a second protection unit connected to the first protection unit. The first protection unit further includes a first body having one surface side and the other combined surface, the combined surface arranged on the opposite side of the surface side. The second protection unit, includes a second body and a first adhesive layer which is formed on the second body and towards one surface of the first body, can detachable pasted on one surface side of the first body. The multilayer screen protective film attached to the screen of the electronic products which first protection unit has filter or reduce a blue light resistant function emitted by the screen can protect the eyes of a user. When the second protection unit is used for a period of time and be scraped by foreign objects, the second protection unit can be directly removed, thereby maintaining good visual effect of the screen.

Abstract: The projection device contains a main member, a transmission element, and an anti-slippery element. The main member has a built-in power element, an internal projection module, and an accommodation groove along a side of the main member for storing the transmission element. The anti-slippery element is configured on a major side of the main member for positioning a mobile device. An end of the transmission element is data-linked to the projection module, and the other end is configured with a MEL (mobile high-definition link) connector and is connected to the mobile device. The content on the screen of the mobile device is synchronously delivered to and projected by the projection module. The electricity required for the operation of the projection device is provided from the power element. The power element can also be used to charge the mobile device when no projection from the latter is required.