■Opposite charges produced by point discharging can neutralize the charges in thunder clouds to weaken parts of the downward lightning.
　　■The current-limiting effect of the semiconductor needle resistor impedes the development of the upward leader, thus eliminates the upward growing lightning.
　　■The special shape of the end point enhances the attractive capability to the downward lightning, and the shield effect of space charges produced by point discharging can weaken the field intensity around SLE, thus enlarges the protection scope.
　　■Has strong wind-resistance capability,and can resist the wind power up to 50m/s
　　■The protection range is calculated according to the provisions of GB/T16438-1996
　　■In high earth resistance regions, the shock grounding resistance can be reasonably larger, but it should not exceed 30 Ω