... mode 3.ISO 9001:2000 certification 4.Economical model Economical power Inverter Features:1. Compact Structure, Easy To Be Installed.2. Vector ... -noisy running function.Relay modulaFeature1.Univwersal input2.Measuring accuracy0.3%,manual/ automatic control free exchange.3.Relay, voltage SSR, ampere (4 ... output.6.Could control temperature, pressure, flowing, humidity accurate. Economical power inverter