Feature: 1. Quick Fault Detection: This red light pen can quickly detect and locate the fault point of the optical fiber, convenient for maintenance, very efficient and practical. 2. Excellent Integrated Chip: Adopt integrated chip, which integrates power management, imported laser head, and high thermal conductivity switch control, provides strong light source. 3. Multi Purpose: Featuring standard 2.5mm universal connector, supports FC interface, SC interface, ST interface, to meet your different needs. 4. Laser Head Protection: Designed with a laser head protective cover, prevent the laser head from being damaged by dust and affecting performance. 5. Ergonomic Design: The ceramic tube core can be replaced by yourself, the pen body is made of plastic material, sturdy, comfortable to grip, lightweight and portable, easy to use. Specification: Item Type: Visual Fault Locator Material: ABS Output Wavelength: 650nm+ 10nm Batteries: 2 x AA batteries (shipped without batteries). Package List: 1 x Visual Fault Locator1 x Lanyard1 x Storage Bag1 x Manual