Provides microphone access to Valcom’s one-way amplified speakers! – Provides Contact Closure – 600 Ohms balanced and 50,000 Ohms inputs Works with most microphones with push to talk switches – Built in Microphone Preamplifier – Mounts at Microphone Location – Provides a Set of Form “C” Contacts – May be Connected to a Selected Zone of a Multi-Zone Paging System – Connector Terminals for all Connections