Description Product Reviews Valcom V400 Dynamic Desk Top Microphone 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 0 Reviews Hide Reviews Product Reviews