Finally, it is the most wonderful time of the year, but wait the lights are not working! The LED keeper is the only tool on the marketplace able to diagnose and repair LED light sets. Simply plug the LED keeper into the same circuit of the failed LED light set. The LED keeper uses insulation piercing technology this enables users to tap into the LED light sets and illuminate the functional sections. Through the use of place markers provided, the process of elimination helps the user to locate the errant bulb or socket. If the bulb is removable replace the bad bulb with a good bulb. If the bulbs are not removable, pods are provided with the LED Keeper to replace inoperable bulbs on the LED light set. These pods are important in maintaining electrical balance in your LED light set.Details:YellowRequires 9V battery, includedContents:Bulb testerFuse testerBulb puller