Protect computer equipment from lightning strikes, outdoor speakers and transmission line vulnerable to lightning, the lightning transient high current when cut and transmitted into the earth, and the broadcasting equipment of computer room have the effect of protection, is equipped with four groups of independent input/output channel, channel in each group of 70 ~ 100 v, 20 a, concise LED LED light for normal operation and fault protection indicator, 1 0 v road warning, short circuit, automatic cut off the output when subjected to lightning, lightning will automatically into the earth, and the over voltage protection and leakage protection.