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Sometimes it's hard to find the socket and enter plug in it for blind peoples.
They can't see the wholes of socket so it made trouble for them to do that. As you know this problem happened for us when socket is placed in bad situation and we can't see that clear.
Slide was designed for this problem, blind or ordinary peoples.
When put plug in it, thats not important where it is, because two part of front surface are slope toward the middle part, hence it move smoothly across surface of socket and move easily and quietly, until fall in the middle groove, now by moving just in one direction it happened.