Feature:1. Fiber Optic Tester: Specially designed for optical cables and lines maintenance, the VFL pen could locate defects on cables, visually search for fiber breaks.2. Easy for Operation: Conforms to ergonomic design for easier turning on and off, the VFL can also be used as a lighting for working and operation in the dark.3. Better Application: A must have tool for fiber optic engineering construction, fiber optic network maintenance, and fiber optic device production and research.4. Wide Compatibility: Comes with a 2.5mm universal interface for FC SC ST, the visual fault locator can be quickly charged by power bank, computer, adapter and more.5. Convenient Carrying: Light in weight and compact in size as well, the fiber light tester is very convenient to carry with you for outdoor works.Specification:Item Type: Visual Fault LocatorTest Distance: 15KMWorking Current: 150mABattery Life: >3.5hOutput Level: 3 adjustable level output. Output Wavelength: 650nmInterface: 2.5mm Universal InterfacePower: Built In 600mAh Lithium Battery (Shipped With Battery) Storage Temperature: -40~+85 Working Temperature: -20~+60 , no condensing. .Package List:1 x Visual Fault Locator1 x Ceramic Sleeve1 x User Manual