sound signalling device meaning in English

声响信号器
声响讯号装置

Sound signalling devices for household and similar purposes
家用和类似用途的声音信号装置
Sound signalling devices ; acoustic horn bugles for low voltages
音响信号装置.低压嗽叭形音响号角
Multi - tone sound signalling device
复音声响讯号装置
Road vehicles - sound signalling devices - tests after mounting on vehicle
道路车辆.声音信号设备.车辆安装后的试验
Sound signalling devices for domestic and similar purposes . safety requirements
家用和类似用途的声音信号传输装置.安全要求

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