Compact and easiest way to identify fibers from end to end and shines over bare fibers and 3mm jacketed fibers to help you pinpoint breaks, bends, faulty connectors, splices and other causes of signal loss. Bright red laser at 650 nm. Has a reach of up to 10km (depends on fiber attenuation) with 10mW power output. Pulsed and CW operation. 2.5 mm universal connector interface. Battery backup of 15 hours. Handy and Light weight rugged aluminium case package.