Pfannenberg Series BR 50 stack lights provide convenient visual indication for status, alert, and alarm as well as audible warning of machinery operating condition or process status. The easy-to-assemble component architecture supports up to five interchangeable modules. Choice of modules include bright LED and filament lamps for continuous or blinking operation, and hi-visibility flashing xenon tubes. The horn sounder module supports audible alarming to complement visual warnings that may go unnoticed.