Description: LIQUID PRO™ MARKING SYSTEM Liquid Pro™ Marking System is a patented method of applying marking paint without propellant! This makes shipping, storing and disposing of empty paint cartridges safe and easy. The Applicator pumps marking paint from the unique Paint-In-A-Bag™ cartridge by pulling a vacuum to dispense the paint – no compressed gas can and no crushing or pressurizing required. It operates from a lithium-ion rechargeable battery. Additional battery packs are available so you’re always on the move.