The MS Series Inverter/Charger a pure sine wave, 120V-60Hz inverter designed specifically for the most demanding mobile and off grid applications or grid-connected back-up systems. -20C to +60C operating temperature range. MS Series idle power in search mode is 7W, no load is 25W. ETL listed to UL/cUL 458, UL-1741, CSA C22.2 #107.1-01. 3-year warranty.