Fixes most light sets in secondsGreat for pre-lit treesOver 5 million units soldIncludes Audible Voltage DetectorAdditional Features: Bulb & Fuse TesterBulb Puller and 10 Bonus Bulbs includedComes complete with 1.5V batteries (3)Don’t toss your light sets, fix themSave your net lights, icicle lights, garlands and wreaths