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Fireman Intercom / 2-way Emergency Voice Comm System
 Vanguard Model: V25-70 Hardwired Version Vanguard Model: V25-90 Addressable Version 
Vanguard V25-70 Hardwire Fireman Intercom SchematicVanguard V25-90 Addressable Fireman Intercom Schematic 
 The hardwired version is used in small to medium size projects with up to 60 to 70 handsets. The addressable version is used in bigger projects where cabling cost and cabling space requirement of hardwire system becomes excessive.
V25-70 Hardwire Fireman Intercom
V25-90 Addressable Fireman Intercom