Louroe Audio Monitoring AMT-600 Line Driver takes audio signals from Louroe Microphone (Models A, B, C, D, E, L-DT, or K) and amplifies it to 0 dB at 600 Ohms balanced, for input over desired transmission (fiber optics, etc.). Provides one-way listen-only at the Louroe Base Station. 12 Vdc plug-in power supply included. NOTE: If two-way talk/listen is required, use AMT/R-600 Line Driver/Receiver instead of AMT-600.