LH-RJ45 series surge protector device are specially used for various computer networksuch as ethernet network (LAN), toke-ring network ,and its satisfied different types lightning - proof areas,the connector of its input and output is RJ45 maie/female connector,which is easily connected and installed and installed ,and it is main used in server equipment, working station (intranet) and router, HUB,and board band RJ45 interface protection for protection equipment, which will damaged by the over voltage of the earth or the line inductance.