Traffic light indicators of multiple designs specifically designed for cleanrooms, locks, sensors, cables, custom made adhesive membranes. All in one to offer a complete door interlocking solution with 100% YDG components. All YDG traffic lights are built with RJ45 connectors for easy and safe installation. Some indicators also offer programmable pinout function. All indicators are equipped with audible alarm that will sound in case of violation of interlocking logic or door left open for too long time.