Item Type: Optical Fiber Red Light Test PenModel: AUA C20Material: Aluminum alloyOutput Optical Power: >20MWOutput Distance: 20KMOutput Wavelength: 65010nmFiber Optic Adapter: 2.5mm connectorOperating Temperature: 0-+60Storage Temperature: -20-+70Battery Type: 1.5v AA batteries x2 (shipped without batteries)1Problem Finding Ability: The visual fault locator is designed to maintain fiber optic cables and lines, for locating defects on cables, visually searching for fiber breaks and using the device. 2Stable Performance: The performance of this test pen is very stable, with a stable output power, which means that it can improve the efficiency of the user. 3Convenient Carry: Small size and light weight are the features of this test pen, you can carry this test pen with you when you need it. 4Non Contact Connection: This test pen uses a non contact connection that does not damage the end face of the fiber and transmitter, and the output power is not affected by voltage fluctuations. 5Energy Saving: This test pen has an energy saving design that allows the test pen to have a greater battery life for longer use.1 x Red Light Pen1 x Pen Bag 1 x Lanyard1 x Ceramic Core 1 x Instructions