The surge protector device designs according to the national standard of GB/T18802.21-2004/IEC61643-21:2000 Applicable for Video, coaxial cable protection, special for the CCTV system, DVR device, Video switches over-Voltage, over-Currency, electrostatic discharge damaged the device possesses the futures as follows: Multi-level over-voltage protection, integrate function, width capacity, low limit-voltage. fast response, low insertion loss, high speed etc. Relative humidity: ≤ 95% Atmospheric pressure: 70kPa~106kPa