Feature: 1. MAIN USE: Pen type visual fault locator is a device specifically designed and maintained for locating defects in optical cables and cables. VFL is used to visually search for fiber breaks and detect defects in optical cables. 2. EASY TO USE: Simple operation together with 30km output distance largely simplifies the testing and greatly improves working efficiency. 3. ANTI INTERFERENCE: Non contact connection, lossless fiber optic and transmitter end face, output power not affected by voltage fluctuations, providing you with accurate and timely testing. 4. ALUMINUM ALLOY MATERIAL: Made of premium aluminum alloy material, this fiber optic cable meter is strong and sturdy, wear resistant and lightweight, has a long service life. 5. WIDE APPLICATION: Allows for broad application on telecommunication, CATV engineering and maintenance, integrated wiring construction, etc. Specification: Item Type: Visual Fault Locator Material: Aluminum Alloy Fiber Optic Adapter: Universal connector Output Distance: Approx. 30000m / 98425.2ft Output Wavelength: 650 ± 10nm Operating Temperature: 0 to +60 ℃ Storage Temperature: -20 to +70 ℃ Battery Type: Built in polymer lithium battery capacity 400mah (shipped with built in battery). Package List: 1 x Visual Fault Locator 1 x Manual 1 x USB Cable 1 x Ceramic Core Note: Battery cover cannot be opened.