Easy and Accurate IdentificationIt can easily and accurately detect and locate fiber breaks, bad connections, bends or cracks. The detector will emit bright light at 650nm for fiber tracking, breakups or defects where the fiber refracts light. Convenient Design and Excellent FunctionSmall size, lightweight, with multiple functions such as constant power output, low battery warning, long battery life and long distance detection, it is portable and easy to test on site. The pen-style design with pouch makes it easy to carry, easily check fiber faults with the visual fault locator, and the rugged dust-proof design keeps the clean fiber optic connectors. WIDELY USEDThe detector's universal 2.5mm connector is compatible with round and square interference designed for various ST, SC, FC fiber optic cables. Test singlemode and multimode cables. Long Distance OutputThis 15mW visual fault locator with battery output, strong red light can be up to 5km, high efficiency power supply circuit can achieve stable power supply. Outdoor Mode & USB Charging Rotary Switch - Automatically extends the pen when powered on. Metallic material, outdoor fashion, touch and beauty coexist. USB charging design, built-in 1800mAh lithium battery, long standby time. Support multiple devices to charge anytime, anywhere.