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Which key does Xianyang taxi meter press to invoice?

Press the supervision button for the invoice of Xianyang taxi meter, and the specific steps are as follows:

1. Insert the instrument into the vehicle power socket and start the instrument.

2. Before departure, the taxi driver clicks the meter, and when he arrives at the destination, he clicks Finish.

3. Press the supervision key, the empty car light will be changed from passenger to empty car, and the meter will print out the invoice.