Rechargeable visual fault locator (VFL) has the function of fiber identification and faults locator of SM or MM fiber, it is a helpful assistant to dead zone of OTDR, it is also a basic maintenance tool for fiber network as well as telecommunication network systems SPECIFICATIONS VFL Wavelength: 650nm±15nm VFL Output Power: Available in 10mW, 20mW, 30mW VFL Flashing Frequency: 2Hz Connector: 2.5mm universal connector LED: 4LED（50mW） Battery: 18650 Lithium battery 3.7V/2200mAh Mobile Power: Output 5V/1A Packaging Size: 37x39x147mm Weight: 165g Lock Switch: unlock the button; lock the button. VFL: Press VFL key circularly to enter into the three states: CW-GLINT-OFF. LED: Press LED key to turn on the lighting LED; press Lighting key for 2 seconds to enter into the SOS flashing mode. Power Switch: Press power switch key, indicator shows the battery power; press twice quickly to turn off the indicator. Mobile Power(5V/1A) (Power Bank): Device will be charged if USB connected, 2200mAh large-capacity lithium battery reverse charging (when using power bank, turn on the Power Switch).