jez smith wrote:
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They have mice inside and the mice watch the coins as they go down the slot,and then the mice compare the coins going down the slot with photos of real coins and depending what they see they press a button.
Ehis is why you'll pften see the coin slots bunged up with stuff as people have been trying to feed the mice.

hmmmmmmmm....that explains the noises i hear during my long conversations on phone.