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2 sonoff basic some differences

Hello Just received my First 2 sonoff basic. There Is a difference as you can see in the picture attached. One has a capacitor where the other One does not. So, what should i do? Which Is the right One? Is It important and what Is its function? Thanks a lot
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Seems they are modified. AC out function has been disconnected. However, there is a free room with 2 holes for the capacitor to be placed. Did someone pull out the capacitor? I suppose the capacitor is across the relay coil to add a sort of delay to avoid relay chirping . Probably, you may add a same value capacitor and study the result.
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