Timing Chips

Here's one for you techno boffins out there. Sitting at home is a envelopes for both the FLM 1/2 and Reading 1/2 marathons. Both with similar looking timing chips in them. What happens if I take the wrong one to the race this Saturday and how do they work?

Also an after thought, are they really worth £10 a piece, must be millions of them out there.

Cheers, M.

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