Product: LERDN was established in 2004, who is a growing young company full of energy. LERDN endeavors in researching and manufacturing electric safety protective products, which include two series: lightning and surge protective device, and electric fire monitoring system. Application: LERDN has various products, which include: portable SPD tester, power supply PSD, control signal SPD, computer network SPD, electric fire monitoring system, etc; which provide reliable electric safety protective solution to mobile communication industry, railway industry, petrochemical industry, new resource industries of solar and wind, electric power industry, etc. Intellectual Property: LERDN appreciates intellectual property rights and owns multinomial patents in country of origin (China) by way of independent research. Quality: LERDN provides five-year product quality guarantee and high-quality service in global. LERDN owns comprehensive inspection equipments, which include: stimulant lightning current impulse test stand, network analysis meter, SPD performance tester, on-line aging test stand, etc. LERDN strictly carries on ISO 9001 and ISO 14001 management systems. Products are all true of ROHS standard. During research and manufacture, LERDN actively reduces the heavy burdens of environment and safety, and pursues sustainable development through constant improvement.