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I need your help replacing my old timer


I have an old Intermatic ET171C timer for my outdoor post lights at our Church. Can you please let me know if the Sonoff POW or if you have any recommended Sonoff product, that I could use to replace my current timer? I have attached a picture of my timer. 

Can you also tell me how to change connect wires by showing a simple diagram? Thank you for your help. 


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