5km Red Pen 10Km Fiber Optic Test Pen，20Km Red Light Source 30Km Lithium Battery Rechargeable SC/FC/ST LC Connector

Product Introduction VFL wavelength: 650nm+/-15nm VFL output power: 5/15/20/30mW VFL flashing frequency: the more 2Hz LED lighting: 4LED (50mW) Built-in battery: 3.7V 1800mAh Support 2.5mm universal interface, FC/SC/ST Package Included: 1x red light pen 1xUSB charging cable Features: Lighting function: Short press this button to turn on/off the LED lighting Red flashing function: 1. Long press this button for 2 seconds to turn to 650nm red light flashing, 2.Press for another 2 seconds to turn off the red light flashing function. 3. When the red light is turned off, the working state of the 650 red at the time of shutdown is automatically saved Reset function: Long press this button for 6 seconds, the machine will restore the initial, and the machine will restart automatically after completion