The document describes voltage detectors that are used for outdoor high voltage lines and switchgear equipment. The detectors have a precise and stable operating threshold to detect voltages without interference from induced voltages. They provide double signaling with bright flashing lights and an audible alarm that can be seen and heard from over 50 meters away. The detectors are robust and resistant to impacts, vibrations, extreme temperatures, and humidity. They are available in different models for various voltage ranges.