Security lock (4) for releasably with one another is to be fixed parts (1), such as shopping or luggage cart, comprising a housing (21) with an opening (7, 17), in which a deposit (9, 16) can be inserted, the parts (1) in order to detach them from one another, characterized in that the deposit or a with the deposit (9, 16) apparatus which is connected, in particular, the security lock (4) a sound source (12, 19) which, by on the deposit (9, 16) stored information or of the deposit (9, 16) received signals for the delivery of loud / tones can be excited.
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