2 in 1 Surge Protector for CCTV System power supply: 220V AC :DK-DS/M 220 SPD 24V ... control line of camera of safety protection system in warehouse, community and transportation supervision system. Characteristic of product(1) Effectively prevent equipment ... , low residual pressure, fast response, large current capacity, long life span;(4)Small size, convenient installation, easy maintenance 2 in 1 ...