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An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage.
Image: Darklanlan, CC BY 4.0 · Text from Wikipedia, CC BY-SA 4.0
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An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage.
Image: Darklanlan, CC BY 4.0 · Text from Wikipedia, CC BY-SA 4.0