Combined shell made from sturdy PC fire-retardant materials, allowing for over 10,000 connect/disconnect actions. With fitted rubber boot covers, protect against dust, moisture and corrosion. Both ends are suitable for connection to the power or load side because of its identical connectors. The ends are made to connect only one way, making it impossible to connect the wrong polarities to one another, preventing accidental reverse polarity when hooking up a charger. The heavy duty components are suitable for low or medium current use. With 4 terminal pins made of red copper coated with silver have strong electrical conductivity and reduce the resistance to guarantee stable voltage and current.