Welcome to our store! 1. Fast Fault Detection: This red light pen can quickly detect and locate the fault point of the optical fiber, convenient for maintenance, highly efficient and practical. 2. Excellent Integrated Chip: Adopts integrated chip, which integrates power management, imported laser head, and high thermal conductivity switch control, providing a strong light source. 3. Multi-purpose: With a standard 2.5mm universal connector, it supports FC interface, SC interface, ST interface, to meet your various needs. 4. Laser Head Protection: Designed with a laser head protection cover, preventing the laser head from being damaged by dust and affecting performance. 5. Ergonomic Design: The ceramic tube core is replaceable by yourself, the pen body is made of plastic material, sturdy, comfortable to grip, lightweight and portable, easy to use. Item Type: Visual Fault Locator Material: ABS Output Wavelength: 650nm±10nm Batteries: 2 x AA Batteries (Shipped without batteries) 1 x Visual Fault Locator 1 x Lanyard 1 x Storage Bag 1 x Manual Customers are our top priority. If you encounter any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.