In standby mode, press the time key once and the 2 digits on the left side of the time will flash. Press the numeric keys to set the hour to 24-hour format. Press the time key again. The 2 digits on the right side of the time will flash. Press the numeric keys. Set the number of minutes and press the time button again to confirm that the time setting is successful. Based on the query-related public information display, set the current time, determine the stop and change of time data, and confirm the validity of the data. There are two main types of air machines, one is ozone and the other is ultraviolet light. The ozone formed by the former can complete oxidation in a short time under low concentration conditions.