Handheld 10mw Fiber Optic Tester Portable Pen Type Red Light Visual Fault Locator Rechargeable Pull-out Type Fiber Test Pen It is used to detect optical fiber breakpoints, and is used in the construction and maintenance of integrated wiring, telecommunications project and maintenance, CATV project and maintenance and other fiber-optic project. Features: The interface adopts a pull-out design, which is waterproof and dustproof, and has a longer service time. Small flashlight with bright LED lens, convenient for cable insertion and construction in dark environment. Highly integrated chip, integrating power management, signal modulation, and switch control. Stable light emission, strong light source, high accuracy, sufficient power, easy to penetrate optical fiber. USB rechargeable design, large capacity battery, long working time. 2.5mm universal interface to meet various connector needs, the adapter heads and ceramic heads can be replaced by yourself. Specifications: Color: black VFL wavelength: 650nm±15nm VFL output power: 10mW VFL flashing frequency: about 2Hz Interface type: 2.5mm universal connector LED: 4LED (50mw) Battery: 3.7V, 2200mAh Item size: 147 * 39 * 37mm / 5.8 * 1.5 * 1.5in Item weight: 165g / 5.8ounce Package size: 175 * 50 * 50mm / 6.9 * 2.0 * 2.0in Packge weight: 200g / 7.1ounce Packing List: 1 * Fiber Optic Tester 1 * USB Cable 1 * Storage Bag