1. and portable for easy carrying and comfortable hold. 2.Longer penetration distance, stable performances and long service time. 3.3-gears brigtness adjustable, and there are power signal lights, pay attention to the power at any time. 4.With LED light convenient for dark environment operation. 5.2.5mm universal pen heads, detachable, easy to replace the core. support USB charging, charging treasure, COMPUTER USB port It is used to detect optical fiber breakpoints, and is used in the construction and maintenance of integrated wiring, production and research of optical c-omponents and other optical fiber engineering. Output wavelength: 650nm Output power: 15mW Interface: Universal 2.5mm adapter (FC / SC / ) Battery: Lithium battery Color: Black Material: plastic Package Contents: 1Set x 15mW fiber optic red visual fault testers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.