USER-CONTROLLED VARIABLE FLOW: from 0.1 – 0.6 GPM, 90PSI MAX; Adjust flow rate for a broad range of applications & uses. Eliminates over-application of chemicals. Consistent application rate increases efficiency on the job! 18V 2.0AH LI-ION BATTERY POWERED: Provides consistent pressure, NO PUMPING, saves time and energy! Fast Charger included: Fully charges 18V lithium-ion battery in 1 hour. INTELLIGENT PRESSURE SWITCH: Internal pressure switch automatically toggles between high and low to manage peak pressure at the low (1-3) and high (4-10). INTELLIGENT FLOW MONITORING: Automatically adjusts to maintain consistent output pressure and flow for any dial setting regardless of battery life.