Edwards SignalingHorns, 874 SeriesItem# 874-R5 - Adaptahorn, 240VAC, Grille Type Indoor Applications874 Series Information 12~240 VAC 103 dB at 10 Ft. Volume Adjustable Completely Assembled UL; FM Approvals The Edwards 874 Series are low current, high decibel surface mount vibrating horns for heavy duty use. Supplied complete with Adaptaplate for easy installation. Supplied Adataplate allows quick plug in connection. Horn simply plugs into receptacle on mounting plate. Also mounts on any single gang, 3 1/4" (83mm), 3 1/2" (89mm), 4" (102mm) octagon, or 4" (102mm) square box. Used in industrial, commercial, and institutional applications for timing, paging, and alarm signaling. Applications include equipment malfunction alert and security warning.