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Simple transmitter/receiver

Last Modified: 2013-12-09
I need a simple rf circuit to detect that some one has pressed a button thats it. I dont care who pressed the button just that a button was pressed. I want some thing very simple but it has to be reliable no false triggers from stray rf signals?

What im after is a simple transmitter that a person can hold then press a button which is then picked up by the receiver? there can be multiple people holding transmitters.
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