F3 light USB bicycle headlights 3 t6 mountain bike rechargeable light LED lights professional riding bike lights

Operation method: turn on the lights 1; First link the power cord of the lamp holder to the power cord connector; 2; Press the blue switch on the back of the light to turn it on. Gear adjustment: In the open state, press the switch to realize low, medium and high brightness adjustment. Double flash gear entry: press and hold the switch for 3 seconds to enter the double flash gear; Brightness indicator description: After the lights are turned on, the 3 indicator lights on the back of the F3 will light up, indicating that the power is above 80%. After the lights are turned on, the 2 indicator lights on the back of the F3 will light up, indicating that the power is above 50%. After the lights are turned on, an indicator light on the back of the F3 will light up, indicating that the power is above 20%. After the lights are turned on, an indicator light on the back of the F3 keeps flashing, indicating that the battery is too lo