Features: Universal for 2.5mm FC ST SC interface. Battery power supply, long operating-time. Aluminum cover, comfortable to grip, metal texture, anti-slip. Small size, lightweight and portable, can be put in pocket. Imported laserhead, high thermal conductivity easily penetrates long-distance optical fibers. Specifications: Material: Metal Output: 50mW Working Temperature: 0 to 60℃ Store Temperature: -20 to 70℃ Battery: 2xAA Batteries(NOT Included) Size: Approx. 175x26x26mm/6.89x1.02x1.02in Package Includes: 1x Tester Pen 1x Rope 1x Pen Bag 1x Manual note: Do not look directly at the red light. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.