The ECharger from ATS provides a ripple free charger with built-in EWatchdog to maintain proper voltage during programming. Should the charging voltage drop below recommended values, the built in EWatchdog alerts the technician with a visual light and audible alarm. The ECharger comes with selectable high and low voltage settings and is available in 55 Amp (No. CHR1000) for most vehicles and 90 Amp (No. CHR1010) for all vehicles, including BMW.