light switch question

I have an programmable light switch that I would like to replace a standard switch. On the standard switch the case is earthed ok. The standard switch has 3 red wires going into it: Two wires into the common terminal and the other into a terminal marked "1 way". How do these wires go into my programmable switch? It has 3 terminals on the back: Load, live and 2 way. Thanks..

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