The Gumwand contains a small LPG canister, a built in reservoir for the cleaning solution, a rechargeable battery and our clever little pump. The battery powers the pump, which injects the cleaning fluid into the vaporizer at a rate around 3ml per second. The LPG powers the heating unit built into this lightweight machine. This combination of natural chemical, steam and slight agitation with either brass or nylon brush completely removes the gum and stain in 5-7 seconds. In one hour you are able to remove 650-700 pieces of gum with an extremely easy to operate piece of portable equipment. The whole unit is easily portable weighing only 14 pounds. Its wheels mean no strain on the operator's arm or a requirement to carry anything. A nylon brush is also available for indoor use on carpets and tiles, which is perfect for pubs, clubs, cinemas, theatres, casinos, schools and colleges (sold separately). Brass brushes are good for all exterior hard surfaces such as asphalt, concrete, brick, pavers, stone. These can also be used indoors for tile and grout, elevator tracks or door thresholds (sold separately). The Proprietary Gumwand cleaning solution is derived from totally natural and sustainable sources and is ph neutral. It instantly turns discarded gum into powder, which leaves no residue. This item uses a blue 14.1oz Benzomatic Propane tank that will last for approximately 7-8 hours of run time (sold separately). A rechargeable battery is built into the unit and comes with a charger. 1 Year warranty.