Key features of SONOFF POWR3 Compared to POWR2, the charging current of POWR3 increases from 15 A to 25 A and the power reaches 5500 W. It is a powerful smart switch that can make your high-performance devices intelligent or act as a smart meter for a single room by connecting all devices in the room to POWR3 and counting the energy consumption of each room individually. From anywhere, you can see which devices are turned on. It not only visually displays how much power you are consuming, but also stores your historical energy consumption for 100 days, which can be exported to CSV on your phone.