Vindicator is a light probe signal system designed for use by individuals who are blind or have low vision, or who are deaf or hard of hearing. This system is primarily used to make electronic equipment accessible to employees with sensory disabilities, enabling them to work independently in switchboard, security, and other technical and service-oriented environments. It uses optical and electrical sensors to automatically detect signals in security monitoring and other equipment, and provides corresponding notification to individuals with sensory disabilities. The standard output is digitized speech in any language. Other optional outputs are available, including large format alphanumeric displays, LED (light emitting diode) indicators, audible tones, serial interfaces to computer systems, electrical signals, etc. Available configurations include Vindicator Standard, Vindicator Button, Vindicator Wired, and Vindicator RF. Vindicator Standard detects when LED, VFD (vacuum fluorescent display), or LCD (liquid crystal display) display indicators turn on and off and provides notification of these changes using digitized speech or other optional outputs. Different words or phrases can be output for each indicator when it turns on, when it turns off, or both. It is available in 8 and 16 line versions, one line for each electronic display indicator, and a speech-enabled stand-alone unit or one that provides a serial interface to computer systems or other electronic equipment. The serial interface version is also compatible with the DigiCite and Responder systems from Compusult (see separate entries). Vindicator Button detects when an LED or VFD display indicator turns on and off and provides notification of these changes using audible tones. Each button is a small, standalone device designed to fit over a single electronic indicator to provide audible output as an alternative to a visual display. Buttons are available with various audible tones to help identify different indicators and events. Buttons are unobtrusive and require no internal connections to existing electronic equipment. Vindicator Wired detects voltage on/off conditions from an electrical panel or other device and provides notification of these changes using digitized speech, large format LED displays or encoded output via a serial interface to a computer system. It is available in 8, 16 and 40 line versions, one line for each external input, and a speech-enabled stand-alone unit or one that provides a serial interface to computer systems, LED display systems or other electronic equipment. The serial interface version is also compatible with the DigiCite and Responder systems. Vindicator RF Switch detects when equipment, switches or indicators are on and off and transmits notification via radio frequency to a receiving unit for output using audible tones and large LEDs or digitized speech, and can be used to identify events in locations away from an individual's general work area. It is available in single or multiple transmitter/receiver versions.