Feature: 1. VFL Red Light Pen: This red light pen is designed for fiber optic cable installation and maintenance, helping to locate faults in optical fibers and cables. 2. Non-Contact Connection: The connection method is non-destructive to the fiber and transmitter end face, and the output power remains stable regardless of voltage fluctuations. 3. Stable Output: The fiber optic pen provides consistent output power with a transmission distance up to 50 km, making it a reliable tool for fiber testing. 4. Compact and Portable: The device is small, lightweight, energy-efficient, and easy to carry for field use. 5. Aluminum Alloy Housing: The durable aluminum alloy shell offers resistance to corrosion, rust, impact, and wear, ensuring long-term durability. Specification: Item Type: VFL Red Light Pen Material: Aluminum Alloy Output Power: >50mW Output Distance: 50 km Output Wavelength: 650±10 nm Operating Temperature: 0–60 ℃ Storage Temperature: -20–70 ℃ Battery Type: 2 x 1.5V AA batteries (batteries not included) Color: Black Package List: 1 x VFL Red Light Pen 1 x Pen Bag 1 x Lanyard 1 x Ceramic Core 1 x Instruction Manual 1 x FC to LC Converter