http://www.dallasnews.com/incoming/20150916-0916ahmedclock.jpg.ece/BINARY/0916ahmedclock
That is the device. Doesn't look like an invention or a clock but like he took a clock apart and pieced it together to make it look like a bomb.
He was interviewed and I think he slipped, you can see it here, but he says, "I didn't want to lock it to make it seem like a threat so I used a simple cable so it wouldn't look too much suspicious" . https://www.youtube.com/watch?v=3mW4w0Y1OXE So he just accidentally admitted while making it that it was suspicious. He knew as he made it it would look like a bomb casing.
When the teachers and officers were questioning him, he said it didn't look anything like a bomb, it was just a clock. Well if he didn't think it looked like a bomb, then when he was making it, what was he trying to make sure didn't look too suspicious???
I think for some reason he purposely and knowingly made it to look like a bomb and either wanted to show off or make somebody think it was a bomb case. The alarm just happens to go off in the middle of class? He set it to go off. The police said he wasn't talking just saying it was a clock, gave no explanations.
So this kid who when building it knew it was suspicious as a bomb from the start, then plays smart allec saying it's just an alarm clock and pretends to be confused why anybody would think otherwise other than him being muslim.
He brings a fake bomb to school, and is celebrated, invited to the white house for his 'cool clock, umm bomb', and a big chunk of american sheeple in fear of being called racist now claiming what would have gotton anybody arrested if they brought to an airport or the white house as absolutely not suspicious at all and paved the way for real terrorists to use them now because if they make one they can just say it's an alarm clock or people will just ignore a valid threat for fear of being called racist or an idiot if it was wrong.