Ron blinked a little at the odd little cylindrical object. It looked sort of like a wonky Muggle lighter, but he didn't smoke. At least, not since that one time he'd tried a cigar and it turned out Fred and George had rigged it to explode in is face and his mother had had to regrow his eyebrows. The only thing worth the lecture he'd got that time was the even bigger lecture Fred and George had got.
"Er... , " Ron said, twisting it in his finger. "That's very nice, Professor, thanks." He didn't know exactly what he was supposed to do or say with the thing, but he didn't want to appear ungrateful. Plus, with Dumbledore, you'd either get some roundabout answer that didn't make sense until AFTER you almost died, or no answer at all.