Four preset keys can come true single refueling, for example, four keys all can be set to 30 yuan, 10 liters, 100 yuan, 30 liters. Worker can finish refueling operation with him setting 100 yuan preset key. Comparison of other dispensers, every time worker can reduced the 3-6 times key-press as using preset key and greatly reduce the possibility of wrong operation.

According to estimating, the worker can reduce 1000 times operation each service station every day if they use preset key dispenser, thus they can save 30 minutes operation. New technology can increase around 1.5% sales during rush hour.