TWO-STAGE APPLICATION DEVICE FOR INSTALLING SCREEN PROTECTORS AND KIT COMPRISING THE APPLICATION DEVICE

A two-stage application device is disclosed for installing a screen protector on a display screen of a screen-mounted device. The application device includes a base, a first actuating lever, and a second actuating lever. The base includes an accommodation and a support, wherein the support defines first grooves and second grooves. The first actuating lever has first controlled pivot portions guided and limited by the first grooves, a first pressing portion, a first arm, and a body with a positioning protrusion. The second actuating lever has second controlled pivot portions guided and limited by the second grooves, a second pressing portion, a second arm, and a body. A kit is also disclosed for protecting a display screen of a screen-mounted device, which includes a two-stage application device, and at least one screen protector including a protective film with at least one adhesive layer, and a backing sheet.