employee badge

[pareshnj]

how does a employee badge work

[pinus]

I think we need a few clues

[dodgyshirt]

I think we need more than a few for this one.

[MrsCheeks]

It has your name on it which helps customers to identify with a human being, instead of just an automaton.

[norfolk boy]

The clip holds it on to your top.

[New Forester]

I suspect you mean some kind of automatic gadget which makes doors open for the right people? It probably has a transponder chip in it. Near the door is a radio transmitter sending a coded message. The transponder chip uses a tiny bit of the radio energy to respond with a very weak coded radio message, detectable by a receiver nearby. If this code is correct, the door opens. The anti-theft gadgets in shops work in a somewhat similar way, and so do the identification chips implanted in pets. It could perhaps also be a more sophisticated circuit, with a battery and programmable code.