Make sure that you are prepared for an emergency. Use a "electrical main shut-off" sign. A sign makes a point.
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Size: 10" x 14" Material Type: SmartGlow Glow-in-the-Dark Adhesive Sign Verified PurchaseNice sign
The sign is made of heavy weight stock, the glow is strong out to about 25', after that it is noticeable at about 75'.