Machfally smart alarm powered USB night bike riding single dead bike mountain rear light BK300

About Product:Machfally intelligent warning USB charging night single dead fly bike mountain tail lamp BK300 mode: Low light bright highlightin the bright flash highlighting slow flash explosion flash mode switch: Click on the button switch normally on mode brightness (double - click the button will change quickly flashing mode) the same operation in flash mode switch flashing mode (double - click the button will Change to the normally on fast mode