A 710g device with a dimension of 160 x 114 x 105 mm has a precision level of +5%, ranging from: 0-20 kPa 0-150 mmHg. It swaps each convinced stage of time between OFF and CONT modes, creating a synchronized irregular suction. A flow of 50 L/min (Int: 9 L/min) of frequency can be adjusted with an approximate ratio of 2:3 measured over OFF and COUNT. It has a negative pressure relief valve.