Feature: 1. The detector will emit 650 nanometers of bright light, which is used to easily and accurately detect and locate fiber breaks, poor connections, bends or cracks. 2. 2.5mm (approx. 2.5mm / 0.1in) universal connector test, single‑mode and multi‑mode interface fiber optic cable, red light output distance of 5 kilometers, replaceable ceramic core can extend the service life. 3. The pen tip is made of reinforced stainless steel, and the main body is made of aluminum, which has high impact resistance and prevents damage from static electricity and discharge. 4. With practical design and excellent functions, precise design, effective dustproof. Small size, light weight, easy to carry, multiple functions such as constant output power. 5. Widely used in Telecommunications engineering and maintenance, CATV engineering and maintenance, cable systems and other optical fiber projects. Specification: Item Type: Electric Tester Pen Material: Aluminum Alloy, Stainless Steel Model: Visual Fault Locator Output Wavelength: Approx. 650mm / 25.6in Interface: 2.5mm(Approx. 2.5mm / 0.1in) Universal Interface Output Optical Power: ≥5mW Battery Type: 2 x 2A Battery(Delivered Without Battery) Application Scope: Telecommunications Engineering and Maintenance, CATV Engineering and Maintenance, Cable Systems and Other Optical Fiber Projects. Package List: 1 x Electric Tester Pen 1 x Electric Tester Pen Cover1 x Ceramic Core1 x Lanyard1 x User Manual Note: Delivered without battery.