AtlasIED's UHT70C-U51-8 are 8" diameter single voice coil speakers equipped with dual (whizzer) cone and 10 oz. ceramic magnet to deliver extended frequency response with high intelligibility and minimal distortion. Cost-effective units are complete with fire-retardant moisture-proof cones, factory-mounted 70.7V transformer, 6" color-coded leads, DC blocking capacitor and a 51-8 baffle. To comply with UL requirements, speaker packages must be used with UL-approved enclosures Features Attractive Ceiling-Loudspeaker/Baffle Assemblies Provide Unobtrusive Appearance of Life Safety and Emergency Signaling Loudspeakers Listed Under UL Standard 1480 (Speakers for Fire-Protective Signaling Systems) Selection of Baffle Styles and Multi-Tapped Transformers Meet a Variety of Aesthetic and Application Requirements Selection of UL Approved, Companion Enclosures is Offered UL Listed, Fire-Retardant and Moisture-Proof Cone Loudspeakers Reproduce Emergency Alarm and Voice Instructions with Superior Intelligibility and Extended Frequency Response