INSTALLATION STEPS:
1. Put the suction cup into hot water(about 140°F) for 10 seconds;
2. Wipe the suction cup and glass clean with wet wipes;
3. Find a suitable position and forcefully attach the four suction cups to the glass;
4. Squeeze the air in the four suction cups by hand;
5. Rotate the four knobs to fix;
6. At the end of the installation, pull a few times to see if it is firm, if it is not firm, you can remove it, and then repeat the installation steps