The Verifact Model E is an omni-directional, low impedance, electret condenser microphone with built-in preamp that is housed inside a single-gang weather resistant Bell Box®. Design for External applications. Surface mount only. Model E microphone is compatible with all Louroe base stations. Produces line level output. Dimensions: 2 3/4” W x 4 3/8” H x 2” D, 1 Year Warranty.