Clever!

It takes a lot for something new to join in the fun on my keyring.

I carry only 2 keys and a Stormtrooper. Recently I also added this HSBC magic number thing to it. I have absolutely no idea how it works but I have to tap in the number it gives me into my business bank account online and it lets me in.

I'm trying to cut down on everything I carry about on me. But this 'thing' is an essential. It's passed the audition, gone through to judges houses and won the live finals of Jayman888 keyring X factor.

Can anyone shed light on how it works?