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Black out is an emergency lighting device.
When the black-out situation happens, it'll automatically light on and be ready for use.
There are four for one set, and it'll provide enough lights for ordinary families to use for everywhere.
The hall way or living room will be the perfect place for it. And also, when you hang it up on the wall, users will easily raise their hands and get them down for use immediately.
National Chiao Tung University