Used to detect power and ground, also to find shorts and breaks. Patented Instinct® Handle for style and comfort. Molded internal contact links with the LED assembly top dimple for low-loss signal transfer. Smart LED design has more brilliant light output and longer life than traditional bulb. Finger turn screw-on strain relief is easy on/off, has flexible wire protection at the critical bending point and is O-ring sealed. Low power consumption smart circuit design. Copper clip is a superior quality component for maximum electrical signal transfer. Terminal screw connection makes cord replacement easy and ensures a positive electrical signal connection. Superior flex wire glides past components and remains flexible even in cold conditions. Premium rubber boot material stays flexible over its life and it is replaceable if it gets damaged or worn out.. Convenient circuit board and spring assembly for quick install and positive contact. Technical support: 1-888-382-6522.