By using our automatic door closer, you reduce the sound of closing doors and prevent damage to your doors. Whether for your home or office, our door closer reduces closing noise, thereby contributing to an excellent user experience. Installation Instructions: 1. Attach the arm to the door closer body with the included screws and silver wrench. Ensure the arm remains in the correct position. 2. Determine the installation location, usually in the middle of the door. Use a screwdriver to tighten the four screws into the door frame. For faster installation, we recommend using an electric drill. 3. Use adhesive to attach the base metal plate in the correct position on the door and complete the installation. Spring Force Adjustment: After installing the door closer, adjust the spring force to find the correct closing force. Increase Force: 1. Insert the wrench into the ignition and turn it from right to left (or follow the arrow on the adjustment port). This will increase the spring force. 2. Test the door's closing force. 3. If you need to adjust the door closer's force again, use the wrench to loosen the adjustment screw and reset the spring tension. Repeat the first two steps as needed. Decrease Force: Insert the wrench into the adjustment port and press down firmly to decrease the force. Friendly Reminder: Wear gloves during installation to prevent hand injuries. Packing List: 1x Door Closer 2x Mini Wrenches 1x Arm 1x Adhesive 4x Screws 1x Metal Base 1x Small Screw