His inventions include a guide robot, an earthquake alarm and an electronic door lock.
2
地震报警系统的开发与部署已受到广泛的关注，地震开关是其中关键的技术手段。
The development and deployment of earthquake warning system have been paid more attention to recently, in which the seismic switch is a key tool.
3
本实用新型涉及一种地震报警器，由电源电路、震动传感器、报警延时控制电路和声响报警电路连接构成。
The utility model relates to an earthquake alarm which is formed by the connection of a power circuit, a vibration sensor, an alarm delay control circuit and a sound alarm circuit.
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