Louroe speaker/microphones are two-way talk/listen remote stations. Microphones are low impedance, electret condenser with built-in preamp and produce line level output. They are phantom powered from the Louroe Base Station with 12 Vdc power. All speakers, regardless of size, are 8 ohm with a 70V transformer. All Louroe Speaker/Microphones can be mounted up to 1,000 feet from the base station without additional amplification.