1. DC to AC 2. CE , ROHS , FCC approval 3. high quality , best price ... (optional)Optimum Efficiency90 %No Load Current Drawless than 1A Low Battery AlarmDC 10.5~11.5V , 21.5~23V ,43~46VAuto ... Low Battery ShutdownDC 9.5~10.5V, 20.5~22V , 41~44VCooling ...