The Proactive Low Flow with Power Booster 2 LCD XL Controller is engineered specifically for the Stainless Steel Monsoon XL Pump. With the Low Flow with Power Booster 2 LCD XL Controller, the user can precisely control the water discharge with the turn of a knob. The Low Flow with Power Booster 2 LCD XL Controller is used to monitor and regulate low flow sampling (Fractional Flow) as low as 40 mLs per min. Simply connect the booster to a 12-volt deep cycle battery and connect the pump to the booster and stand back for awesome pumping power!