Vibrating horns produce a continuous horn sound as long as power is applied, screw terminal wiring connection--then plug the horn on to its mating plate. indoor use, (Outdoor Use Horn Model 876), 120VAC .13A, 240 Volt AC version available--select above when ordering. FEATURES: Tamper resistant construction, easy installation, mounts on standard 4" electrical box (not included). Efficient operation, 5" square, Very Loud 103db @ 10 feet with volume adjustment down to 78 dB, UL Listed, and FM Approved.The Edwards 874 is a low-current, high decibel surface mount vibrating horn for heavy-duty use. Supplied complete with Adaptaplate® for easy installation. Also mounts on any single gang, 3 1/4", 3 1/2", 4" octagon, or 4" square box. Used in industrial, commercial, and institutional applications for timing, paging, and alarm signaling. Applications include equipment malfunction alert and security warning. .
The horn heard around the world.  An economical audible horn for your signaling needs from sports scoreboards to machine start up and start/stop work systems...

• Voltage available: 120 VAC, and optional 240 VAC select when ordering 
• Operating Current: .13A at 120 VAC
• Temperature Range: Not Available
• Listings: U.L. and FM Approved
• Mounting: mounts on standard electrical box
• Indoor Use
• Audible Output: 103 dB @10' with adjustment range down to 78dB, The DC voltage version of the horn is approx 93dB at 10 feet
• Life Expectancy: approximately 400 hours at 50% duty cycle