Features [Fiber Fault Detection] Driven by a constant current source, this visual fault locator efficiently detects fiber faults by entering multimode and single mode fibers when connected to the optical interface. [Multiple Power Supply Options] Support various power supply methods such as alkaline batteries, power banks, computers, adapters, and can batteries. [Illumination Function] This fiber visual fault tester facilitates line inspection and construction in dark environments such as outdoor settings, data centers, and night time operations. [Ergonomic Design] This visual fault locator is lightweight, ergonomic designed, comfortable to use, user friendly, ensuring ease of handling. [Wide Usage] This is an indispensable tool in fiber engineering construction, fiber network maintenance, and optical component production and research. Specification: Item Type: Visual Fault Locator Material: ABS Test Distance: 30KM Working Current: ≤170mA Battery Life: >5h Gear Output: 3 adjustable gears Output Wavelength: 650nm Interface Type: 2.5mm universal adapter Power Type: AAA battery x 2 (shipped without battery) Storage Temperature: -40℃ to +85℃ Working Temperature: -20℃ to +60℃ (without condensation) Package List:1 x Visual Fault Locator1 x Ceramic Sleeve1 x User Manual Package List 1 x Visual Fault Locator 1 x Ceramic Sleeve 1 x User Manual