Infusion rates from 0.25ml/hr to 143ml/hr with syringe sizes from 5ml to 50ml. The infusion rate is set on a 2 digit counter. A stop switch disconnects power at the end of the syringe. â€œMâ€ option will allow the flow rate to be decreased to .10 the normal speed (0.025ml/hr to 143ml/hr). "W" option is a Key interlock for IV pole plate.