VFS1000 series QwikBUS™ stations selectable electronic tone signaling, Voice On, Door Release, Call Volume, and five (5) momentary button switches (marked '0', '1' and '2' and 2 blanks).
Crystal-Clear Half-Duplex Voice Operation
Easy Installation - Only 2 Common (loop) Wires Required
Eavesdrop Privacy
Clear Voice Fidelity using Electret Condenser Microphones