Feature: 1. VFL Red Light Pen: This red light pen is designed for fiber optic cable and line inspection to help identify faults in cables. 2. Non-Contact Connection: This 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 Construction: The aluminum alloy housing is resistant 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°C Storage Temperature: -20-70°C 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