Before revision: The voltage range of the successor Pump Express Plus 2.0 is between 5 volts and 20 volts, with half a volt between each step (5.0 V, 5.5 V, 6.0 V, ..., 19.5 V, 20.0 V) .
After revision: The voltage range of the successor Pump Express Plus 2.0 is between 5 volts and 20 volts, with 0.5 volts steps .