The Sure-Lites Lifeway II C Series is a single phase inverter that provides uninterrupted power. This pulse-width modulated inverter utilizes IGBT technology and has a two millisecond transfer time. The unit's operating efficiency is 98 percent, which is well above a typical fast transfer inverter. The C Series inverter is UL 924-listed and meets NFPA 101 requirements by providing 90 minutes of illumination for emergency egress lighting. Other run times and voltages are available; please consult your Eaton representative.