All right, thanks.
Now everything is clear.
One more thing: I'd like to exchange one of the ring I received with a smaller one, should I directly mail email@example.com ?
Dear John and dear all,
Last month I received 4 rings and was really happy to see the project I backed was finally here :)
Unfortunately I've not an Android right now and I haven't yet tried them out…
I backed a collection + 1 KS Limited ring.
What I had to receive was: an Alpha, a Stealth Bomber and two Normal rings.
What I actually received is: 3 normal ring, an Alpha Q/A failed and an Alpha Voucher.