Verifact Model A: Microphone In Sturdy ABS housing Verifact Model B: Microphone In Sturdy ABS housing w/3' to 10' Extension Cable Verifact Model C: Microphone Mounted to a Small PC Board in Rectangular Plastic Housing Verifact Model D: Microphone Mounted In Single Gang Stainless Steel Faceplate High sensitivity to low sound pressure Microphone can pick up normal sounds 15' away May be located up to 1000' from base station Phantom powered from Louroe Base Station Microphone preamp contains sensitivity switch for lowering gain.