Allen Bradley Siren, 12 to 24V AC/DC, 80dB at 1m - 855P-B30SE22 This siren alarm from Rockwell Automation's Allen Bradley range emits a continuous or pulsing alarm sound of up to 80dB (decibels), making it a reliably audible warning signal. The black plastic enclosure has a diameter of just 30mm, so it's compact enough to be mounted onto a tight panel setup via a standard 22.5mm hole. It has tin-plated brass terminals to ensure resistance to corrosion and reliable conductivity, meaning you can be sure it will provide long-lasting and robust performance. Features and Benefits • Wide operating temperature range of -25°C to +60°C for use in a variety of tough conditions • Supply voltage of 12 to 24V AC/DC enables use with a range of power supplies Standards and Certifications • ANSI/ESD S20.20:2014 (American National Standards Institute) • BS EN 61340-5-1:2007 (British Standard) Is this siren suitable for use in harsh industrial environments? IP2X rated ANSI/ESD S20.20:2014 BS EN 61340-5-1:2007 The siren has an IP65 (ingress protection) rating, so it's dust-proof and able to withstand low-pressure jets of water. The contacts are also rated to UL (Underwriters' Laboratories) 4/4X and 13 for protection against solid objects and fluids.