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When an earthquake occurs, it usually accompanies with many waves of aftershocks. Therefore, people should leave dangerous zone immediately, to reach a safe place immediately, waiting for rescue, in order to avoid more serious casualties.
Balloon Rescue Sign, a safe place guide device, can be utilised during rescue. It is like a balloon floating in the air, that people on ground and rescue helicopter pilots can find these balloons promptly. Even though rescues are launched in dark, smoggy, foggy environment, people can still reach safe place rapidly via its signal transmission and lighting function.