Flying alarm clock - how do you turn it off!?!

[jellybelly2007]

My DS1 got a flying alarm clock from argos for his Bday last week. I thought the point of it was, when the alarm sounds, the helicopter blades fly off to force you out of bed.
Then, when you find the flying bit, you replace it on the alarm bit, and it stops.

IT DOESNT STOP!!!!!!

AAARRRRGGHHHHH!!!!

We have tried pressing all the buttons, but it STILL doesnt bloody shut up. It sounds like an air raid siren, and goes on forever.

We cant find the instructions, but surely, it cant be this complicated?

Does anyone have one of these? Can you help me turn it off?
We ended up taking the batteries out, am wondering if I should take it back.

The switch must be broken, putting the rotor back is supposed to stop it.

Take it back.

The rotor bit shoots off, but you have to find it to put it back and turn the alarm off.

Video

Thanks.
Thought I was technically inept all of a sudden .
Will take it back.