Designed for Alro Pro charging,charging plug stick with hole | 4.5 mm thick diameter, length of 10 ft (3.05 meter),it's sturdy and durable,Black color. | The wire was add with corrosion resistant materials,low temperature resistance can hold minus 20 degrees Celsius,and high temperature resistance can reach 80 degrees Celsius,it can effective resistance to acid rain and sun. | MICRO USB plug was made with oxidation processing, it can be more effective in the outdoor work long hours.