Miss, you still have some metallic things with you.It is impossible.Please check it again.Oh, I got it.1t is my keys. It is metallic thing. Sorry.Never mind. Please put them on this tray.And put your baggage to the belt again.No problem.Please go through this gate.What's matter?There are still some metallic things with you.Let me check it.Yes,it is my buckle.That's OK.