Universal Metal Ring: Unlock fast and easy wireless charging with the ring and case on; Compatible with PC or TPU cell phone case. Enhance Magnetic Strength Loop: Unique design enhances magnetic strength to ensure your phone attached securely to all Magnetic accessories. Durable Metal and Sticker: Perfect fit between phone case and magnetic accessories. Optimize charging efficiency and easier magnetic performance. Thin and light : Works for All Phones and magnetic accessories (phone mounts, Magnetic wallets, and magnetic wireless car mounts, etc.) Easy Setup: Tear off the backing paper, attach the ring to the outside of a smooth phone case. ( Leave on for 24 hours before use with Magnetic Accessory.)