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The distress call device produced by Zhengzhou Huazhi Technology Co., Ltd. complies with the GA401-2002 standard and is used for firefighters to report emergencies. It has waterproof, explosion-proof, compression resistant, high temperature resistant and other properties. The static alarm time is 20-30 seconds, the alarm sound is greater than 95dB, and the power supply can be used continuously for no less than 15 hours.