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. Features: Built in overcurrent protections circuit, even if it is full, there is no need to worry about overload and damage to the machine. Replaceable and rechargeable battery. Push-type automatic flip, more convenient to work. LED lighting for easy operation in dark environments. Standard 2.5mm interface. Fine quality laser probe, the penetration distance is longer and the service time is longer. Specifications: Output power: 15mw Output wavelength: 650nm Interface: 2.5mm Color: black Main material: plastics+metal Battery: 7V, 600mAh Item size: 125 * 35 * 17mm / 4.9 * 1.4 * 0.7in Item weight: 38g / 1.3ounce Package size: 150 * 50 * 35mm / 5.9 * 2.0 * 1.4in Packge weight: 50g / 1.8ounce Packing List: 1 * Fiber Optic Tester 1 * User Manual 1 * USB Cable