Additional product info: Stick it on the back of your smartphone to support holding it, or change the angle of the ring to use it as a stand. This product does not completely prevent the attached smartphone from falling. It cannot be used on surfaces made of glass or smartphones and smartphone cases treated with anti-fouling or anti-fingerprint coatings. If the part where you attach it is a lid for battery replacement or memory card exchange on your smartphone, the lid may come off during use. Be sure to wipe clean the area where you attach this product before use. Using it with dirt or oil left on may reduce adhesive strength. Depending on your smartphone, you may not be able to use it as a stand. Smartphones are not included.