These Excel electronic pipettes from Labnet are multi-functional units with standard and reverse modes for pipetting operations. They are also designed for sequential and multiple pipetting for sample mixes and serial dilutions. All of the functions can be programmed easily by one person via the display and keypad. The piston drive is fully motorized and allows for auto-collaboration. There are six operational modes available, all of which offer exceptional precision and accuracy. The lithium-ion battery is rechargeable. This ensures that the units will work for hours in between charges. The volume settings are simple and precise.