Patented product, on the basis of the original made further upgrades, product performance more perfect, more precise movements, the system spread to 30ms in two weeks to eliminate over-voltage grounded arc, the highest-standard, the device is currently the only microcomputer controller relay through the National Testing Center, a four-tier interference test and type test, the use of special deep unsaturated pt, able to withstand 4 times the working voltage is not saturated, thus virtually eliminating the hidden system resonance over-voltage! Welcome to the owners and friends to switch manufacturers, after the company investigated the specific order! Thank you.