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When an earthquake occurs, it usually accompanies with many waves of aftershocks. Therefore, people should leave dangerous zone, to reach a safe place immediately. Balloon Rescue Sign +, which is integrated with streetlight, can be automatically activated by the central service system when a disaster warning alert is activated. During an emergency situation, streetlight can project safe sign to guide people to the nearest shelter. As the meanwhile, balloons can auto-inflate and float in the air, that people on ground and rescue helicopter pilots can find these balloons from far-away promptly.