FireFly® Fuse Tool Voltage Detector – Minimize Work Time, Maximize Work Safety The FireFly® Fuse Tool Voltage Detector, model FTVD-15, combines a fuse tool, voltage detector and spotlight in one single product, saving time and adding an extra level of safety while working on distribution lines. The voltage detection function will check for voltage on the line - red LEDs will flash and an audible alarm is activated when voltage is detected. Then use the Fuse Tool function to open and close the fuse or switch. Bright white spotlights located on both the top and front of the tool will provide illumination at night or in the dark for better visibility and added safety. Get the work done three times as fast with the FireFly® Fuse Tool Voltage Detector!