Feature: 1. VFL Red Light Pen: This red light pen is specially designed for the design and maintenance of fiber optic cables and lines to locate defects on cables and cables. 2. Non Contact Connection: This connection is non destructive to the fiber and the end face of the transmitter, and the output power is not affected by voltage fluctuations. 3. Stable Output: The fiber optic pen has stable output power, the output distance is 50km, which is a good tool for fiber testing. 4. Small and Portable: The fiber optic pen is small in size, light in weight, energy saving, and easy to carry for outdoor work. 5. Aluminum Alloy: The aluminum alloy shell of the positioner is corrosion resistant, rust proof, and resistant to falling and wear, providing a long service life for the positioner. Specification: Item Type: VFL Red Light Pen Material: Aluminum alloy Output Power: >50MW Output Distance: 50KM Output Wavelength: 650±10nm Operating Temperature: 0-60℃ Storage Temperature: -20-70℃ Battery Type: 2 x 1.5V AA batteries (shipped without batteries) Color: Black. Package List: 1 x VFL Red Light Pen1 x Pen Bag1 x Lanyard1 x Ceramic Core1 x Instruction1 x FC to LC Converter