Specification:Model: BWJ650-10 Output optical power: 10MWOutput distance: 10KMOutput wavelength: 65010nmFiber Optic Adapter: Universal ConnectorOperating temperature: 0-60Storage temperature: -20-70Battery type: 2 * AA battery(not included)Mode: Constant Light Type and Pulsed Type Features:2. It can locate fiber breakage, bending, etc.3. Compact shape and it is convenient to carry4. The tester pen has ability to identify end-to-end fiber and detect fiber optic passive components and optical communications5. Used in telecommunications, CATV engineering and maintenance, integrated wiring construction and maintenance, optical device production and research, and optical passive components and optical communication testing