telephone exchange system
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Fire Alarm Hooter | High Decibel Electronic Siren | | 24V DC Fire Alarm Device | ABS/Metal Body | Loud Emergency Alert for Office, Factory, Warehouse
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Advanced Handheld Metal Detector | High Sensitivity Scanner | Audio Vibration LED Alert | Rechargeable Battery | Portable Security Device System Unit
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Wall Mount PA Speaker 100V Line | Available in 5W / 6W / 8W / 16W / 30W / 90W Variants | Indoor & Outdoor Audio Speaker for Office, School, Shop & Home