Welcome to the store! Safe Usage: The fiber optic tester incorporates nanotechnology, featuring multiple electrostatic shields and a light port protection mechanism, ensuring safe operation. High-Performance Chip: The fiber optic pen uses a high-grade integrated chip that integrates power management, signal modulation, and switching control. Strong Light: The fiber optic visual fault locator has intense red light that easily penetrates long-distance optical fibers. Aluminum Alloy Body: The fiber optic cable tester features a high-strength aluminum alloy body, durable and impact-resistant. Compact Size: The visual fault locator is compact in size, easily fits into a pocket for convenient transport. Product Type: Visual Fault Locator Material: Aluminum Alloy Battery: 1.5V AA batteries x2 (not included) Usage: Fiber Optic Communication Detection Operating Wavelength: 630nm to 670nm Package Includes: 1 x Visual Fault Locator 1 x User Manual 1 x Carry Bag 1 x Strap Your satisfaction is our highest priority. We will provide you with the best service. If you discover any issues after receiving the product, such as damage or incorrect quantity, please contact us immediately for the best solution!