Multi-functional Intelligent Tester Pen: This smart voltage tester pen can accurately detect voltage levels, identify live and neutral wires, and locate line breakpoints with ease. High-Brightness Operation: Equipped with bright beads, this test pen allows for clear visibility, even in sunlight, making your electrical testing more efficient. Portable & Easy to Use: Designed like a pen, this tester is lightweight and easy to carry, making it perfect for professionals and home users alike. Advanced Intelligent Chip: The upgraded professional chip on the main board ensures higher security and longer service life, providin reliable results every time. Durable Chrome Vanadium Steel Head: The screwdriver's batch head is made from chrome vanadium steel, ensuring durability and longevity in every use. Wide Range of Applications: Ideal for use in electronics factories, electrical appliances, automobile maintenance, and household repairs. Complete Package: Comes with a B11 screwdriver test pen and 3 LR41 button batteries, ready to use right out of the box.