It is used to detect optical fiber breakpoints, and is used in the construction and maintenance of integrated wiring, production and research of optical c-omponents and other optical fiber projects. Features: Widely CompatibleThe 2.5mm universal connector make the detector compatible with ST, SC, and FC connectors, and can be used with different circular and square optical cables. If you need to check the 1.25mm LC interface, you need to purchase a separate FC-LC converter head(not included) Effortless Fault DetectionThe visual fault locator accurately detects and locates fiber breaks, poor connections, bending or cracking. Emitting a strong 650nm light, faults in the optical fiber refract the light, providing an easy way to locate the problem. Long-distance OutputWith its powerful output and strong red light, the VFL can detect faults 3-40 kilometers (optional) in fiber optic cables. The efficient power supply circuit ensures stable power output. Powerful FunctionsThis portable and easy-to-use VFL device has functions such as fast breakpoint localization, long-lasting endurance, and long-distance detection, making it a must-have tool for engineers. Practical DesignCompact and lightweight, one hand can hold and carrying pouch for easy portability. With Pop-up cover, Press the button and the cover can be automatically popped open. The VFL is equipped with LED lighting, which is convenient for line inspection in dark environment and makes work more convenient. Specifications: Model: AUA-5G / AUA-10G / AUA-20G / AUA-30G / AUA-50G (Optional) Power Supply: 2 * 1.5V 350mAh AAA dry battery (LR03) / 1 * 3.7V 650mAh Lithium battery (Optional) Power Range: AUA-5G: 1mW AUA-10G: 10mW AUA-20G: 20mW AUA-30G: 30mW AUA-50G: 50mW Test Distance: AUA-5G: 3-5km AUA-10G: 8-10km AUA-20G: 15-20km AUA-30G: 25-30km AUA-50G: 35-40km Working Hours: AUA-5G Dry Battery Type: 7H AUA-10G Dry Battery Type: 5H AUA-20G Dry Battery Type: 4H AUA-30G Dry Battery Type: 3H AUA-50G Dry Battery Type: 2H AUA-5G Lithium Battery Type: 15H AUA-10G Lithium Battery Type: 10H AUA-20G Lithium Battery Type: 8H AUA-30G Lithium Battery Type: 6H AUA-50G Lithium Battery Type: 4H Wavelength Range: 650nm Laser Type: LD Modulating Frequency: CW/2Hz Working Temperature: -20~+60 LED Flashlight: Support Charging Port: USB interface(charging only) Material: ABS Item Size: 13.5 * 3.7 * 2.5cm / 5.31 * 1.46 * 0.98 inch Item Weight: Dry Battery Type: 37g / 1.3oz Lithium Battery Type: 50g / 1.76oz Package Size: 14 * 5.2 * 2.5cm / 5.51 * 2.05 * 0.98 inch Package Weight: 77g / 2.72oz Package List: 1 * Visual Fault Locator 1 * Ceramic Core 1 * Lanyard 1 * User Manual (Chinese and English) 2 * AAA Dry Battery / 1 * USB Charging Cable (Optional)