This is the tool that repairs most failed incandescent Christmas tree light sets in seconds, eliminating the time-intensive chore of testing each individual bulb. Once the tool is plugged into the strand, a squeeze of the trigger in the handle sends out a pulse that pinpoints the problem and repairs the internal bulb failure. For broken or missing bulbs, an audible voltage detector zeroes in on the culprit, and the attached three-way bulb puller assists in safely removing them. Includes 10 extra bulbs, bulb tester, and fuse tester.